When you're on stage, confidence is extremely important. If you have any hesitation; if you play or speak cautiously, you put the crowd on edge. The crowd begins to anticipate failures and that creates a tense environment. When you're confident, however, that puts the crowd at ease, and they sit back, comforted that you're in control and that they will experience a great performance.
Life is full of pain. Oftentimes the greatest things come right after
exhaustion, hard work, ugliness, and pain. Childbirth, workouts, learning curves etc. Don't avoid discomfort. Embrace it, and appreciate that you are growing, your mind is expanding, and you are experiencing life.
You won't fully appreciate happiness, comfort and ease unless you've known whats its like to hurt, to fight, to struggle and to succeed.