Believe in yourself! Have faith in your abilities! Without a humble but reasonable confidence in your own powers you cannot be successful or happy. I know where I'm going and I know the truth, and I don't have to be what you want me to be. I'm free to be what I want.
Learn from the past, set vivid, detailed goals for the future, and live in the only moment of time over which you have any control: now. Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence. If you can dream it, you can do it. Do it now, not tomorrow