Some of the more sincere JW kids never go through the teenage rebellion stage of drinking, drugging and having fun with the opposite sex; and so when we finally do rebel against the bOrg, we find ourselves as children in an adult world where everyone expects us to know the ropes. I believe the psychological term is 'arrested development'.
Yes, it's frustrating, and I don't have any easy answers. The obvious solution of simply going through a belated adolescent 'rebellion' may work for some, but I have personally found the joys of sex, drugs and rock 'n roll to be insipid and overrated at best. I only found peace by acknowledging to myself that I really had no genuine desire to grow up and fit into adult society. That, in fact, I like being an emotionally stunted adult with the mind of a ten year old. Instead of wishing you were someone else, try accepting yourself as you are; maybe that's who you're meant to be. It may be alienating, but alienation is often the price of authenticity.
And hey, you aren't the only kid out there who is stuck in an adult body. You'll have no trouble finding kindred spirits online or even in the real world if you know where to look. HINT: It won't be at a bar or a church function. Try coffee shops, sci-fi conventions, Subgenius devivals and other off-beat venues.