Self-talk

I quote from John Lembo:

Every waking moments we talk to ourselves about the things we experience. Our self-talk, the thoughts we communicate to ourselves, in turn control the way we feel and act.

Whatever you're telling yourself, even in your mind, controls the way you feel and act. Think positively, and you'll be a happier person. Pre-judge yourself or allow yourself to be judged by others, will only bring about unhappiness.