I am 17 and i've never had a girlfriend, how can i change that?

I'll sum myself up very quickly, i am quite tall and well, lumpy might be the best description, i have fairly boring, languid brown hair, i would consider myself (and i assume others would) quite ugly, with braces, strange over pronounced features and sunken eyes with dark rings around them, i have very thin arms, and little physical strength, my personality is strange, people tell me they like me when they get to know me but i generally clam up whenever someone talks to me, most people except for my 6 real friends think i'm weird, i talk differently, i use big words( mainly because i spent time reading, while other played sports and made friends), and i stutter when nervous, i have heard people calling me a creep behind my back , and i don't like really being in social situations or dealing with people because of these confidence problems. i like to think i have a good sense of humour, but it never shows in school, i'm really worried because i can't talk to a girl, am not a social butterfly, and can never even envision a situation where i would be able to get a girlfriend, or even meet a girl to be friends with. I also feel a lot of pressure from people my age who are so different, i want things to change but being such a social idiot i can't see it happening, and that makes me very melancholy sometimes, does anyone have anything they can say to help?