Of course he likes you, you put out. He's 17, that's what he wants, a girl that gets drunk and does things that other 15 year olds don't do.
If you really want him, and really want to know why he isn't talking to you. Ask him. If he says it was just a drunken mistake, then move on, learn from this. If he says he likes you, realize that it may just be because of that night, and he's probably thinking that next time he can get you to go all the way, instead of just kissing.
No matter what he says, if you keep drinking and letting guys take advantage of you, that's the reputation that you'll build. Do you want to be known as the drunken floozy, or do you want better?