You have no control over whether you can win, but, you have control over whether you give up.
Some losses are necessary to learn: learn to never lose again.
If you can't persist, you won't win.
Your first loss isn't your last loss. Your first win isn't your last win. Keep working.
When you stop trying, you start losing.
Even when you're right, you may lose. What do you do? Either accept the wrong or strive harder for victory.