How do i stop being awkward?

okay, so i'm a 17 year old girl and i've told myself so many times recently that i'm done with guys, for now at least. i honestly have no self confidence, i don't look people in the eye, EVER because i hate the feeling of someone looking back at me. i've never kissed a guy, had a boyfriend, etc. i've only liked guys, and that's as far as it goes, because they never like me back. i get that i'm awkward, shy and completely insecure, i just wish guys would like me. i just wanna be happy. how to i: a. stop being awkward? and b. increase my self confidence? my friends all tell me to look people in the eye, to be calm and collective but for some reason i can't. thanks for the advice in advance.