Hi,
You may be taking part in the performance test, or if that's done and you managed to get to the character screen, you may have set your difficulty very high.
If you get to the character selection screen, press medium punch, then go down once and press left arrow to change the difficulty a little, then press a. Then pick your character and stage.
Also, do you know how this game works? It's not like street fighter ro mortal kombat where you mash buttons. Each character has certain moves that enter the game's combo system, although if you turn on combo assist you'll be able to use light, medium and heavy attacks to possibly enter it. Some attacks, like auto doubles, hit a certain number of times before movign onto the next part of the system. The system works like this:
opener, auto double, character linker, auto double, linker, etc, until you want to end a combo with a character ender.
So if ou were playing as jago, you could try:
Wind Kick (which is quarter circle backwards and kick) if that hits, press heavy punch. Then do a wind kick linker (I'd recommend heavy by pressing quarter circle back and then holding kick (not for too long though) and then press heavy punch, then end it with a fireball ender with is quarter circle forward and any punch.