Im scared of a relationship but i found a guy a really want one with...what do i do?

Yeah, I have the same problems and I'm a junior. I think the worst part would be hanging out with him/her at lunch over your close friends or maybe even with them (which may be more awkward). To be honest, you're the girl in this, therefore if he really likes you he will most likely man up and ask you. If you feel like he is more mature then that is a good thing. Even if this does get awkward it can only benefit you, sure you might get a little awkward but at least you''ll earn some relationship experience if nothing else.