How can I possibly get over him?!!!!!?

There's this guy at school that I like. a lot. In fact, I truly believe that I'm in love. He's amazing in every way imaginable. Problem is, I don't know him at all, as in I've never said a word to him in my life. We've never been in the same cles. Since we don't even know each other, I don't know how I could possibly start a relationship with him. I've been trying to just forget him, but I can't. It's made me so depressed that I can't focus in school and I mourn nonstop after I get home. How do I get over him and be happy?!!!