A positive outlook to your life is so key for success. Whenever someone puts themselves down, or says that they could not possibly do x or y, I am amazed. I would never voluntarily remove myself from the game because that is defeat without even knowing.
If and when I fail at something, I love knowing that I exhausted every effort. I tried my best, I put in my all and if failure is still the result, so be it, because I leave a more evolved person.
Failure is something to appreciate in yourself because being able to fail takes guts. Many people live their entire life within such constraint that they never get the pleasure of a full-fledged, train wreck failure experience…how sad.