Bruce Lee and Imposter Syndrome
Imposter Syndrome: that feeling that your achievements have been a string of luck and it's only a matter of time before you get exposed as a fake.
Many at the top of their craft have come out and expressed experiencing imposter syndrome themselves. Even though we see them as very talented, skilled, and hardworking, these people have achieved so much beyond the odds that they attribute that more to luck than competence. I've also felt imposter syndrome, and am still figuring out how to deal with it.
At the other end of the spectrum is overconfidence.