Have you done anything in your life that you regret?
Don't you ever have any self doubt?
As for things i regret, i always regret every decision i make for one reason or another, I am a perfectionist in a certain style.
On self doubt, I just get over it really, the only thing it can do is wreck myself mentally. But i do have it on occasions, but always tend to work through it. I certainly dont show any doubts publically.