I'm 18 and no relationship experience

I just turned 18, and I only had one real girlfriend that wasn't like an online girlfriend, she wasn't attractive at all and made me spend a lot of money on her, she said that she was saving sex for marriage and kind of made me feel like she was saying that we where going to be together for awhile. I decided that I rather have no girlfriend then a girlfriend that wasn't hot, costed me a lot, and just really didn't have a lot in common with. I think I might have trouble talking to girls that I meet, I am in online school so I don't get to talk to a lot of new people, my job only has people that are over the age of 21 so I am one of the youngest ones there, so I think I might have a anti-social thing going, I don't like to be around a lot of people like malls, and schools. Don't really have a lot of friends like just 4 and most of them I don't see for months at a time because they are always busy. Just wondering what I should do to meet new people and get over my anti-social thing, and find someone that has similar interests and is attractive