I'm Socially Awkward?

I'm almost 18 and I rarely socialized as a child. To this day I still don't know how to act in social situations and I get anxiety around new people, especially guys. I will be moving away to college in two months and am extremely nervous about making new friends. Everyone tells me I'm an attractive girl (not to sound cocky) but I'm so shy I've only ever had one boyfriend and a few good friends. I consider myself to be a nice person but I'm so quiet I come off as a snob. When I do talk to people I never seem to say the right thing/ they don't like me. My self confidence is extremely low due to bullying and I'm very self conscious. I feel pathetic. All I want is to be able to make friends in college and start over. How do I get over my social-awkwardness and lack of ability to talk to guys?