Absence of a positive self image is pretty much the definition of depression. Normally people have a defense mechanism against this in the form of cognitive dis

Absence of a positive self image is pretty much the definition of depression. Normally people have a defense mechanism against this in the form of cognitive dissonance. This is why people are so good at contextualising as the protagonist, or excusing their own wrongdoing, but on the flipside the better you are at honest self assessment the more vulnerable you are to breaking this defense mechanism.