Confidence is the key to doing what ever it is you'd like to do 

Confidence is a state of being clear-headed: either that a hypothesis or prediction is correct, or that a chosen course of action is the best or most effective. Confidence comes from a Latin word 'fidere' which means "to trust"; therefore, having self-confidence is having trust in one's self.

-the state of feeling certain about the truth of something.

-feeling of self-assurance arising from one's appreciation of one's own abilities or qualities.