To build self confidence and overcome low self esteem is to change how we feel emotionally about ourselves. To change our emotion requires changing two different core beliefs about self image. The first core belief is obvious. It is the belief that we are not good enough. It may have a more specific association to how we look, how smart we are, money, or lack of confidence sexually. The second core belief to change is the image of success that we feel we should be. Changing this belief is contrary to logic, but is a must if we are to overcome insecurity and raise our self esteem.
Source: http://www.pathwaytohappiness.com/