I'll chime in on this one even though i'm not much older than you (26), nor am i completely "content". however, i am in a much better place than i was. What caused the change? what brought more happiness in my life? I finally decided that it was time to look out for me and do something that would make me happy instead of worrying about what others wanted me to do or felt i should. here's a brief synopsis:
i graduated from college with honors. moved to a city to be with my then gf and to start a career. well, i hated the city, hated the job, and eventually didn't want to be with my girl. i was miserable in all aspects. i felt like a failure. felt like my life was going nowhere. i didn't feel i had much to look back on and be happy about. so i finally had had enough. i started looking for jobs in other states and broke it off with the girl. once i was given the opportunity for a new life in a new city, i took it. was it the best opportunity? no. but it got me to the place where i knew i would be happier and have a chance at finding a true career. at times things have been rough and as you read in my other post tonight, i still am dealing with things, but i have never been happier with myself. i have done the things most of my friends and family admitted they could never do. its empowering knowing that it was because of me and me alone that my life has improved.
you need to find what would make you truly happy and go out and do it, cuz it ain't gonna be handed to you.