I can't seem to get past the part where you have to fight Steve and then change back to Claire's brother, and the have to fight Alexia... I dont have enough ammo, nor enough life... Is there some sort of trick? *Or am i screwed?

Never give up! First off, you can't kill Monster Steve so just run like hell. What kind of ammo do you have left for Alexia?

Yeah, you can`t defeat Steve, just run back to the door. He`ll hit you twice at least. Don`t fight back, just keep on running for it,healing after each time he hits you.