Well, first off, let him notice you. You can't act like you're trying too hard. Smile to him by the lockers, wave to him in class, you get the idea. Start to befriend him. Does he play sports? Go to a game, try to get in the front row, cheer him on. Hang out with him in the halls, and once you feel the right moment, confess. Is he worth it though? As you befriend him, also make sure he's not a jerk. Sure, he may tease you once in awhile, but that's a sign he likes you. Does he get nervous when he's near you? "Acciadentily" bush him in the hall while going to your next class. Just a little tap, don't make him drop his books. Trust me on this, I'm a guy. Best of luck! If you have any more trouble, just ask another question. I'll do my best to answer!