@RTT entertainment firstly I can understand your worries here. It's not easy to make friends as a blind person, that's just how life is, and your environment, especially as a teenager can make a massive difference.
Your dream does sound freaky, but remember, most psychological research suggests that dreams are essentially the brain clearing it's file cash and movig unneeded items to the recycle bin, essentially filing away thoughts and fears and experiences so they can be dealt with more efficiently.
this is why it makes infinite sense you'd dream about your new school and problems like not being able to talk to someone in the same language, and songs playing (especially if your not into the idea of music).

so, firstly, yes  nerves make sense, however equally there are unfortunately things you just need to get used to and this is one of them.
At this point in time you don't know whether the school will be bad or good, so start with the attitude that you'll give it a fair chance and see.

Actually, to me the idea of a small school sounds like a good one, since you don't have half the gangs and cliques and unruly behaviour you see in larger schools, so again, just give it a try, you might even be pleasantly surprised.

About your activities.
Unfortunately, as a miner on the one hand you'll find yourself having to do things simply to get on at the moment, either because education terms of education, or in terms of your family.

it's all great to "pursue your dream" etc, but those sorts of things often come  by roundabout routes.

For example, voice acting is a good thing to do, but there is a lot more to acting than just speaking dialogue (I've done a reasonable amount myself), there is learning about your audience, being able to read situations, and improvisations, all of which will help you with your voice acting.
indeed, I'd suggest trying general acting in any and all kinds you can, from dance to comedy and seeing what experiences you can learn.

I'm primarily a singer myself, and  voice acting is something I've done and would like to do more, however I've loved the chance to expand my skills and learn to act properly.

You don't have to do music if you don't want to, but bare in mind that there are lots more things kicking around to try, not limited to sitting in front of a microphone.

As to physical activity, well again, physical exercise helps with a lot of things, I don't know enough about the education system in South Africa to say if you need to pass these activities or not, but putting some time into fitness can help quite a lot, even if you can't find anything in terms of martial arts.
this is why I have recently picked up zombies run myself and found it's improved my creativity and mental state hugely.

Again, if you don't want to swim, fair enough, but take a look at all of the things that are on offer before making a final decision.

Hth.

BTW what physical activities would you recommend?

As to what to do, well my best advice is relax, take things naturally and just try to be patient.
Your right, people will be curious, and irritating as it is, simply being patient with the usual "have you always been blind" type of questions can do wonders, as

Also, try to avoid any sterreotypical blind behaviours such as rocking, speaking loudly or demanding things, if you need to ask for something, ask politely.

Assuming your school is not a shit hole, you should  find the ice starting to  melt after a while and people starting to chat to you, usually in Britain this tends to be on the second or third day, though depending upon the country and situation things might vary.

Also, practice that best skill of blind people, "listening!" you'd be surprised how many people will just chat if you listen and ask the right questions, likewise, don't assume anyone is an idiot until they've proved themselves to be so.

finally, and most annoyingly, be patient! even as a teenager, making friends takes time, and as a blind teenager very much more so. Don't expect things to happen at once. If you've not really made any friends for six months, then you might have a problem, but if after the first week your still getting to know people, that's just how things are.

One good friend of mine is a very reserved person, I met her in history of medicine lectures at university, and basically spent nearly an entire term (about eight weeks), just saying "goodmorning"
One Friday, the lecture was postponed an hour, and I suggested getting some coffee, suddenly she was telling me about herself and we've been friends ever since.

Your at the best age to make friends, since personally I've found situations at their best between 17 and 25, before people settle down to procreate and be stupid, and after people have grown up enough to realise they might not be the centre of the universe, but even so, it still takes time.

With zombies run, it all depends upon how you set the ap.
Unless your physically running outside and changing location (which is a bit difficult for a blind person), the default setting which uses gps to track distance travelled will be no good to you.

You will need to either set it on constant pace or step counting.
These both have different advantages. Step counting physically counts your steps thus responds to your actual runing movement, whilst constant pace simply moves the story along and gives you items as time passes, you can also set how fast your virtual running is if you use this setting.

personally, I use step counting when I'm physically running, and use it for 20 minute mission, then  to constant pace whilst I'm doing my  fifteen minutes weight lifting.

You might Once you go to "mission start" you can find the settings by swiping past the start mission button.
You might need to play with them a little, EG because running on a mini trampoline is harder than runing normally, I've had to put the stride length up quite a bit to get to the point I can do a 5k mission in 20-25 minutes.

I don't mind though, since I'm burning off that much energy.

As to other forms of physical activity, it depends upon what options are available and what takes your fancy.
I Personally for example have no interest in competitive sports such as football or cricket, but I enjoy those activities like canoeing, tandem cycling or even cross country skeeing when I've had the chance to do it, that let me get out and journey in a oncrete way.

similarly, whilst I'm  average in hight at five foot ten, I have broad shoulders and  I'm not exactly a small fellow,  and so am naturally pretty strong, someone once told me I have the right build to be a wrestler if I wanted.

This means sprinting is probably not my best area (the zombies run I do primarily to keep fit and increase my mental energy), I'd be better at rowing or kanooing or something along those lines.

Hth.

Maybe I had just luck, but the students you mentioned who just always talk about girls, drugs and parties are there, but if you want to discuss with them about something else, this works nearly all the time. It's not like they're all brutes who can't think of anything else. Mainstream schools are great, at least with my experience. As others have said, just don't let the fact that they're sighted and you're blind get in the way. Just act naturally.

man, just be yourself you dont need to do something extra

Okay as to practical advice, first, learn your way around pronto, even if you need to go in early and do this, since the more you can get around as you wish independently the less you'll stick out to other people.

Perhaps look at walking around the building before school starts to learn the way.
Not that walking around with assistance is a bad thing now and again, but the more comfortable you are in your environment, the more comfortable you'll be with yourself, which others will pick up on as well, plus the less you need to rely on other people, the more you can concentrate on being someone's friend.

I wouldn't say there are "rooky mistakes", I would say there are things you can do to make life easier as I mentioned, namely avoiding too many  blind specific habits like rocking etc, learning to listen to people and practice good communication skills, and being patient and give people time.

Also, be open about your blindness. I have gone through a couple of school or class changes during the last couple of years, and one thing that has worked every time is to ask the teachers for half an hour of the first day. Then just stand up and tell them a bit about your life. Emphasize, that you are a teenager like everyone else, but you have a vissual imparement. Make sure that they know, that you are open to answer their questions, and maybe speak about what you might need help for. It really worked wonders, and show the others, that you are a person that can speak for yourself.

I get you're nervous, but overthinking stuff just makes it worse. Don't go in trying to remember all the stuff you should do and all the stuff you should avoid. That's exactly the contrary of acting natural. Just try to be optimistic about it, give the new place a chance and you'll see. Obviously learning the way around as quickly as possible is great, but if you need someone who helps you the first days, then don't be ashamed, just ask. Most people aren't jerks.

Common fears that are well warranted. I had teachers in high school who would sit around the table and talk about me, while I was sitting at another table listening. To be fair though, I got back at them by talking to other students about them behind their back. Oh man did I ever get yelled at, but I honestly couldn't have given two flying fucks if I tried. Karma is a bitch! My teacher would even yell at me for tapping on the brick wall during lunch time when I was finished with lunch and... oh wait I'm sorry this is about your school. While I enjoyed getting back at my teachers for the shit they put me through sometimes, for you I would recommend avoiding confrontation as much as possible. While it is fun, it will kind of make you look like an asshole and people will try to stay away from you or use it as an excuse to bully you for the sake of getting a reaction out of you. I had bullies that picked on me solely for the reason that I was getting back at my teachers, because in their minds I was just being a disrespectful little prick. Of course, most people saw through the shield of authority they had hoisted up on their shoulders and so they knew who those people were, but that's besides the point. If someone is treating you like shit, don't stand there and take it, but don't be disrespectful about it like I was. No regrets for me though.

@Dark
I verry much see where you are coming from, however I must disagree.
I am only speaking from experience. All 3 times I've used this within the last couple of years, people have later told me, that they were glad that I did it. The trick is, to keep it simple cassual and down to earth, exactly to avoid the problem of isolating yourself. Also focusing a lot more on similarities, for example telling people, that you, as many sighted people do, work out, play computer games etc. This way, you loosen up an otherwise awkward situation where your fellow students don't know if they can ask you questions and about what. I have also had some luck, showing my fellow students NVDA and my braille display, to again make them understand, that while I might be doing things a bit different, I am still able to follow along in class and so on.
In my experience, not telling people is the worst thing you can do, and I've actually tried it. I began at a new school, and only a handful of people knew that I was blind. Not many people talked to me that day, simply because they didn't know. I was the weird guy, that didn't make eye contact, and for the most part sad alone or was with an adult. As soon as I introduced myself, explained a little bit about my situation, and told them, that it really wasn't that dangerous to talk to me, people began talking to me and it amazed me how naturally they went about it.
People are not assholes, but they might be uninformed, misinformed or simply scared to do anything wrong, and that is why I as well as many of m friends prefer to present ourselves to new people in this way.

I'm with Dark on this one. Making a production out of your disability is almost guaranteed to cause more friction, not less. The best way to introduce yourself is to be the person with X hobby and Y interest, and oh yes, just happens to be blind. Putting blindness out there first will just make people hyper aware of it, and I don't necessarily think that's a good thing.