Hmm, where to start?
I've been told that you learn the most about yourself and others in the face of adversity. But as far as molding yourself, that's a tricky job. Chances are you haven't been locked in a closet for most of your life so I'm sure you've had a plethora of experiences. And those experiences taught you nothing of yourself? Ah, they led to the manual of social interaction. The problem is, I don't think we can consciously flesh out our own character. We can try to adopt qualities we admire, but who we are, what we like, how we react to stimuli, our fears, etc, those are usually evolved over the course of our lifetimes. Here's a tip, don't be afraid to try out different things. Try smiling a lot, or frowning a lot. Try being the weird person who wears stripes and checkers and runs for no particular reason. Try everything, and you may find yourself.
That's my $0.02