Please help, there's this guy who likes me...?

and its so obvious and ANNOYING. also he told a bunch of people and now often the first thing people say when they walk up to me is ____ (guys name here) likes you!!! ugh! and he always is trying to touch me. not in a bad way or anything (lol) but like if we are playing flag football he will pat me on the back. or if i get a good grade on a test he will try to give me a hi 5. and in the student body cl one of our most popular activities is the trust activity, where i will have to BOLT to friend i know or be paired up with him. and you know that game where everyone crosses their arms and tries to get untangled? guess who always GRABS my hand first--oo you guessed it right, its him. its just...annoying. how can i make him just go away? he's pretty nerdy, and i dont judge on that at all, but that is also ON TOP of the fact he's always trying to be around me and all. he's just too much. help...?