I won't vouch for its scientific validity but here's an interesting quiz to take: How Real Are You?

I was rated "79% Real": You know who you are, and you're pretty darn comfortable with yourself. Like everyone, you struggle with the parts of yourself that aren't so great... But you're good at accepting who you are and not dwelling on your faults.
As a result, you're confident, optimistic, and very real.

I need to work on that remaining 21%.