I see. If that's how it is, I'm fairly certain that things will change for you in the near future. My story is kind of similar, but in a warped way. I grew up in New York, and studied in a public school system that was incredibly small (graduating high school class size was 108 people, I believe). My friends were people I'd known seemingly forever. One of my friends I've known since kindergarten. I went to college in California, while all of my friends remained on the East Coast. I think there was only one other person who came out to school in California, but it was far from mine and I wasn't personally close to her anyhow. Everyone likes the idea of starting out in a place where nobody knows you and where you can redefine yourself, but not knowing a single other person made it very hard, socially.
It was suddenly very difficult. I'd never been a very social guy, but everyone I reached out to and made friends with felt to me like no more than acquaintances. Once you've had friends for all of your life, how can anything else compare? I noticed how often I was alone and how it seemed like everyone else had a group of friends already. I spent a lot of time on my computer because it was my main way of talking to my old friends and seeing how they were doing. I just couldn't figure out how to make new close friends.
I guess that was the parallel that I saw between the two of us. Eventually I met a guy who was very persistent about spending time with me, and so he became my first friend. I'd been fansubbing heavily and the next year a fellow fansubber was attending our university, so then we had a group of three. We mingled with other fansubbers in the area ("internet people") and it helped me to become more social. Then I branched out and started making friends with lots of people in my classes. I don't know what changed for me - if I'd become more social or if I had just stopped comparing every social link to my friends back in New York. Probably a bit of both. The idea that you could do things with someone but not hang out with them all the time and yet still be friends rather than acquaintances was a big one for me, I think.
The strange thing is that I've sort of lost contact with all but two of my friends from New York, and even then we don't communicate too heavily. I don't know whether your old friends were people you knew since grade school, but if so then I guess our situations are a bit more similar (except that my friends aren't upset with me). In my experience, it was a matter of meeting the right people at the right time and also having my outlook on friendship changed. If it's similar for you then I have no doubt that things will be different for you soon enough. At the very least, you sound like a rather social guy, so you have that over my past self

Just keep your chin up and keep moving forward, you're doing just fine. [sorry for the huge message]