Perfectionism
Perfectionism sets you up for failure by design. Aim for perfect, chances are you wont hit it. Right?
Easier said than done.
I think perfectionism reflects somewhat the lack of selfesteem, you know you suck, so you set a standard higher than what you have confidence you can achieve. Another form of the confirmation bias.
I still hear these days people talking highly of other people: "Oh she's such a perfectionist" - really? Do you have to call her out like that? Let her fight her demons and stop gloryfing that bad trait.
The best line ever, I planned on raising during an "impostor syndrome workshop" : Guys, are you even good enough to have impostor syndrome?