I assume most people here have seen a small child learn to walk. While they are doing it they fall down. Well when they do you pick them up and have them try again.
Life is much like that. Sooner or later something you try is going to go wrong and knock you down. The secret is to get back up and learn from it. Most (all?) successful people had a number of failures and setbacks on the way to being successful, the secret is to learn from them and try not to make the same mistakes again.
For example back in the 1980’s Steve Jobs got fired by Apple and spent 10 or 15 years doing other thing before coming back to Apple to become one of the best CEO’s in America.