"If you are insecure, guess what? The rest of the world is too. Do not overestimate the competition and underestimate yourself. You are better than you think." ~ T Harv Eker

It's easy to think that everyone else has their act together but they're struggling with the same issues we all have.  Successful people just choose to act despite those feelings.  So if you've got something difficult to do, just do it.  Nike was right.