One of the crappy things about getting older is that it becomes much harder to make new friends, with all the real-world hassles, pressures, and obligations we face. Instead of trying to force yourself into a group where you feel like you don't fit, simply do things you are interested in or interested in learning about. Maybe your meetup.com isn't active, but I know people who have used it successfully. You just have to put yourself out there. Even something as simple as facebook can work - join a group that you is about an interest you already have, and see if anyone is local. Even if noone is local, you can still get plenty of good out it. Look at how you've become a member of this community simply based on mere music appriciation.
Another idea that really works is your friends friends. I have some really good friends I met simply through other friends - in some cases I became better friends with my friend's friend than I did with the original friend.