Let go of the idea of winning or losing. In the game of life, the most important thing is just showing up and doing your best.
Aim for your personal best
Every time you evaluate yourself against someone else, you're competing. And every time you compete in this way, not only do oyu set yourself up for failure, you erode your self-esteem. The only person you should ever compete against is yourself. Make the commitment each day to aim for your personal best... Now that's a challenge worth meeting.