I don't know what to do!

Okay, I really like this guy in my music class, and I always talk to him and after a semester of being in a music class with him, I have really fallen for him. I haven’t been able to get my mind off of him lately. The semester is over REALLY soon, I’m talking 3 days, and I won’t see him much after. I am really sad that I won’t be able to talk to him as much until next year when he’s in my music class. IF, he’s in my music class that is.. and I really want to let him know, but every time I try to the words won’t come out. I also know that he probably isn’t going to like me back, seeing that not many guys do. What do I do? Thanks, Desperate