I can actually empathize with a lot of this. I'm 32 and have done jack shit with my life, just without a college degree. Socially I don't mind being much of a loner, but I may be luckier in that respect because of my schizoid personality disorder (has nothing to do with schizophrenia or schizoaffective disorder). My circle of friends right now are basically coworkers (who befriended me, not the other way around) and their friends, a guy from AA I still talk to, and a good high-school buddy and a high-school buddy who was a bit more distant but we were close my senior year. Really I've moved on from high school -- a surprisingly large number never left my hometown and still hang together, even if they went to college -- and I don't care if I ever see them again. I'm no longer interested in dating but sometimes I wonder if that's just an excuse. Probably a little of both.
But I have my hobbies and, between that and getting out a bit, I lead a mostly fulfilling life. I've never had any ambition in anything. Just reading this post makes me a bit concerned about my own life since it seems you were in the same place just a year ago, and I've sometimes wondered if I'm heading for a devastating midlife crisis. But my personality and, again, lifelong lack of ambition or motivation, plus the SPD, might inoculate me from it. We'll see. Until then I'm about as happy as I've ever been (starting Latin really put that in motion).