Albert Bandura is described as the greatest living psychologist and one of the four most influential psychologists of all time. The other three were Skinner, Freud, and Piaget. Bandura originated the term self-efficacy.
Self-efficacy refers to our beliefs about our abilities to make positive changes in our lives. If we don't believe we will be successful we will tend to not try. Conversely, if we believe we will achieve our goals, we will be more likely to give it a try. And then, not too surprisingly, we discover that success builds on success.
Think about Bandura and the power we have over our lives. Then believe in yourself.