I really like a guy in my class but every time I try to talk to him he ignores me and once I get his attention I'm to shy to speak up. What should I do!

Get over your shyness and say something or accept the possibility that he is not interested, since he ignores you when you try to talk to him.

I think you should just start with a simple question about anything really... For example is you are playing soccer just ask him casualy if e has ever played... It sounds stupid but at least you are talking to him and then he willl get to see your personality and he will either love it or you guys will be friends... either way its better than being ignored