Check out the honor/community service society at your community college. You'll be with a group of people who are working towards common goals, which is a great first step to finding new friends.
Or how about picking up a new hobby? Take an art class, join a knitting circle, attend a book club.
don't be so hard on yourself OP. you feel as if you're antisocial because you're thinking you are. law of attraction. i know it's easier said than done, but you're in the mindset of having no one to hang out with, feeling like you have no social life, feeling the "loneliness" of not having a girlfriend, you'll stay in that mindset. if you really feel down and out about whatever certain situation you're in, you have every power to change it whenever you please. if you believe you're a good looking guy, if you believe you're a likable person, put that to use. dwell on your strengths rather than your weaknesses. once you push past the point of being comfortable, then that means you're trying different things. invite your coworkers to watch football or something at your house or at a bar. go out and have some drinks to loosen you up with a few other people you know. put yourself out there. staying in your room will only make you delve deeper into your thoughts.
to conclude, i leave you with something called the Holstee Manifesto.. pretty inspiring if you ask me: