Learned this secret by the time I was 25, has helped me in every aspect of my life since then:

IF YOU KNOW WHO YOU ARE, LOVE YOURSELF AND LIKE WHO YOU ARE, WHO THE HELL CARES WHAT ANYONE ELSE THINKS?

You have to look yourself in the mirror everyday, not anyone else. If you've changed (or are working at changing) the things about yourself that you don't like, have accepted and acknowledged the good and bad within your personality, and live by The Golden Rule (treat others as you wish to be treated), does it really matter what people have to say about you, to your face or behind your back?

You can't please all of the people all of the time...and why the hell would you want to??!!!