To paraphrase George R.R. Martin you wear your self doubt like a suit of armor. You think it keeps you safe from failure but all it does is weigh you down and make it impossible to grow. You must not let your fears rule you, drive you to inaction. They must be faced as you will gain strength, and confidence with every experience where you have looked fear in the face. Once your of failure is conquered you can cast away that self doubt suit of armor and move forward freely in the direction of your dreams.