Oh never mind, I thought it was his. Go tell the principle. Better you first than him telling all this lies. Just tell the principle that he is blackmailing cause you won't give him your psp and games.
I think if you fall for his crap now, he'll do the same thing whenever you get something he wants. If you really didn't do the stuff that he says, I wouldn't worry. Tell your Principal and your parents that he's lieing.
You shouldn't be mentioning the fact that you're drinking at such a young age Anyway, as for the other stuff, several members have already provided you with good advice. Tell someone at school (teacher, principal, etc.) and get this dealt with immediately.