I got started (and I was 26-28!) by going to the first meeting of my local Friends of the Library. I like reading and that seemed like a "safe" place to go; I was wrong :-) as I got asked to be an officer! But I made myself say "yes" to that and that got me a mentor and a couple friends and a bit of a sense of belonging (the activities; book sales, etc.). I would volunteer if I were you; even the volunteer jobs I haven't liked have had some benefits, if only practice with getting out and meeting people and getting a little more "social". Better things that have happened volunteering is getting "seen" by people who have wanted to hire me and/or new friends with common interests to mine and having something similar to a job that makes me look like I'm "doing" something and can make my resume better.

I've used Volunteer Match http://www.volunteermatch.org/ to find volunteer jobs; they even have a large section for online jobs (I did one of those once, best volunteer jobs I've had; I got awards and recognition and it was interesting to me also/I learned new things that helped stir my imagination and helped me in future school courses/jobs).