I wish I could even get friend zoned!

I don't really know why I'm doing this but maybe it will help if anyone sees it. I'm a 20 year old college student without any close friends. I'll start from the beginning:

In high school I guess I was what you could call one of the "popular" kids. I played sports, I was top 5% in my class, dating the cheerleader, and got accepted to one of the top public universities in the nation. I don't want to seem to brag -- because honestly I don't care about any of that. I started dating my ex-gf in 11th grade. It was the whole "first love" stuff blah blah blah. Unfortunately once we started college we both became crazy controlling and full of jealousy - we had each others fb passwords, anything that had to do with either of us interacting with the opposite sex was basically not allowed. Because of this I felt extremely guilty every time I would even talk to a girl in my first year of college. While all my friends from high school were going out and making big groups of new friends in college, I was alone, the only friends I had were the kids on my hall. Looking back on it, it's so crazy thinking that I actually thought that it would be wrong to go out and meet new people. Because of this, I basically did not make any new friends my freshman year of college. I had acquaintances in the engineering school who I would work on with homework and stuff but nothing beyond that. Now I'm currently living in an apartment off campus with two guys from who lived with me freshman year, beyond that I really don't hang out with anyone. They each have their own group of friends from fraternities and other things, so I often times find myself alone in my room reading or playing video games. Now that I think about it - all I do is eat, study, read/game, and sleep. It's pathetic, I know.

This is not the person I was when I was younger - I feel like I already hit my social life prime in high/middle school and now I'm just on a downward spiral to forever alone. I've been a lurker for awhile on reddit and I've noticed all the great advice that has been given so I just wanted to give this a shot.

Soo, what I'm asking of you guys is some advice to getting out there and making new friends, anything will help, I'm pretty much at my wits end.

tl;dr Missed my opportunity to make friends my first year in college due to crazy relationship - don't know how to get out there and meet people, give me you best advice!