Are there friends you regret losing contact with?

Pretty sure we've all had at least one of these but I thought I'd ask anyway. I dropped out of high school when I started having problems with depression and anxiety. I tried to keep in contact with my small group of friends but the fact that I never really wanted to go anywhere for awhile there certainly didn't help things. I kept in contact with one of them more than any of the others but I think this is because we'd been friends for longer.. though mind you, one of the other girls I'd known since I was very little, and I still run into her down the street from time to time. It sucks because we always say to one another that we'll catch up soon but we're just not part of each other's lives anymore. I mean, we caught up properly one time a few years ago but since then it's just been brief (mostly) hellos on the street. I regret losing contact with her probably the most. It doesn't help that I haven't done much with my life and so now whenever I think of catching up with her, or any of the others (though mind you, another one of my good friends from the group moved to another state so I sort of lost my chance there), I feel awkward about the whole thing, like I'll feel stupid around them because they've all grown up and got impressive lives. Maybe a bit of an assumption but from what I've heard they're all doing pretty good. Then again, I'm only 20. So I know, I'm 'still young' and can accomplish things, ect ect. For now though, I just feel trapped in limbo. =/

Uhh. Yeah. So have you ever lost contact with a really good friend and regretted it afterwards? AND, have you then ever become their friend again? Just curious. =]