My hands tend to be full enough dealing with people who hate me for who I am. Concentrate too hard on the millions of people who hate you for what you are and you're likely to turn into one of those unkempt, sloppy dressers who sag beneath the weight of the two hundred political buttons they wear pinned to their coats and knapsacks.
Most lives are not distinguished by great achievements. They are measured by an infinite number of small ones. Each time you do a kindness for someone or bring a smile to his face, it gives your life meaning. Never doubt your value, little friend. The world would be a dismal place without you in it. (tweaked version of a passage from Scandal in Spring)
Life is too short to waste any amount of time on wondering what other people think about you. In the first place, if they had better things going on in their lives, they wouldn't have the time to sit around and talk about you. What's important to me is not others' opinions of me, but what's important to me is my opinion of myself.