Doubt kills more dreams than failure ever will.
When we think of overcoming the doubt we have in ourselves we must plan to do so. Even some of the most confident people will go through bouts of self-doubt from time to time. Conquering the doubt we have in ourselves can easily be done by just referring to what God has instilled in us. You are more than a conqueror, any mountain that lies in your way can be moved if you just refer to the faith you have in him.