Do you tend to doubt yourself rather than believe in yourself? Are you always questioning your worth and downplaying your abilities? We tend to rather dislike brash people who are always boasting about how wonderful they are and what marvelous things they can do. "Show offs and narcissists," we think to ourselves. "So glad I'm not like them!" But one thing you can say for the narcissists - they do have unshakeable self-belief. No matter what anyone else thinks, they believe they're worth it, they believe they can do it. And you can't get away from this fact: people who believe in themselves are statistically likely to do better, measured against people of equal talent, skill and knowledge, than people who always mistrust and doubt themselves.