More than anything else, you're suffering from a lack of self-confidence. Try to be really good at what you do, and use that knowledge to build your confidence

More than anything else, you're suffering from a lack of self-confidence. Try to be really good at what you do, and use that knowledge to build your confidence and assertiveness. This is the subject of countless books, and several past threads on HN. On a more interesting note, it's surprising/shocking to realize how far one can get with controlled arrogance. An archetypal character to study is the protagonist of the TV series 'House'. (But I'm not at all suggesting that you should behave like him!)