If you're frightened of damaging yourself, you increase the risk of doing just that. Consider the tightrope walker. Do you think he spares any thought for falling while he's walking the rope? No, he accepts the risk, and enjoys the thrill of braving the danger. If you spend your whole life being careful not to break anything, you'll get terribly bored, you know... I can't think of anything more fun than being impulsive.
