I definitely used to be like that -- growing up with a mother who would criticize your every move if it wasn't "perfect" will do that to you. After many years of therapy I don't hear that voice anymore. I do the best I can. When I make mistakes, I focus on correcting them and learning from them rather than letting myself get embroiled in the shame cycle of self-blame and flagellation.
But I think it's interesting that in my non-day-job life as a stage actor, I never let my fear of embarrassment or being less-than undermine me in any way. The show must go on and all that. I'd like to think getting into theatre primed me for the work I have had to do in recovery from being an Adult Child of an Alcoholic.