I think that this is a fantastic post, but I'm also genuinely sorry that you feel that way. I completely understand. I think that our circumstances are a little different, but I'm also 27 and find it getting harder and harder to find girlfriends to hang out with, especially childless ones.

One option that I've seen other friends do is actually search for people on OkCupid. There's an option for people just seeking new friends and local people to hang out with. I'm much too shy for that sort of thing, but it could work for you.