I don't think it's necessarily that it's this time in your life. Look at me, almost ten years older than you and in the same damn boat emotionally. I think we like to believe that we "grow up" and figure all this shit out, but that's just not true. The one constant of life is change, and change means that we are continually having to reinvent ourselves and decide who we are. Kinda sucks, but kinda cool too.