Self doubt is a good thing. If more people doubted and considered their actions rather than maintaining the "I AM SO GREAT" attitude, and believing they are gods great gift and their actions are infallible, perhaps fewer shitty things would happen in this world.
As someone who has dealt with depression and self doubt for the majority of my short life, I will say I would be much more terrified of a world where everyone had the outlook on life and self worth that I hold than one where everyone had an "I'm so great" attitude.
Bu t at the same time, we need people who are dumb enough to believe they can achieve something because they're great. They tend to go first and, well, actually do stuff.
We need both those types. Unfortunately, history tends to favor the self-confident (and our current western culture maximize that ad nauseam)
Everything in moderation eh? You don't want a world full of anxiety ridden self doubting depressed people any more than you want a world full of power crazed self idolising maniacs.
It's all in the balance and fortunately most normal people float around the middle of those two extremes most of the time.
