

The challenge is that in reality you have to keep making the choice. Nothing changes with one grand proclamation. Maybe it starts there, but it means nothing without backing it up with hundreds of other choices.
I know one personal challenge I am working on is judging myself by my best day. Everyone has variance of capability day to day. Beating myself up because everyday isn’t my best day is silly.
A Mary Sue is about unearned skill. A person who is just magically good at everything. People don’t like it because in the real world you generally have to work hard, struggle, and sacrifice to achieve significant things. Same reason most people don’t like trust fund babies. They didn’t earn it.