Inaction breeds doubt and fear. Action breeds confidence and courage. If you want to conquer fear, do not sit home and think about it. Go out and get busy.
People say that if you find water rising up to your ankle, that's the time to do something about it, not when it's around your neck.
Let's face facts, this is visual medium, there's a very high premium put on people who are good-looking. But the minute you rely on that you get yourself in trouble. You certainly don't make a career out of that anymore as an actor.