I learned this decades ago from shooting baskets. I found that if I did not at all focus on what I did wrong when I missed [and pay no attention when I made a basket] but rather only focused on what I did right, my shooting abilities increased and oddly enough, people thought I was a good shooter without even tallying the score, I just made it look good... so there is hidden plusses to this type of thinking...
Something interesting to me is the contrast between how depressive people think versus non depressive people. Depressed people attribute their wins in life to the situation and their losses to themselves, non depressive people do the opposite.. so what you have is two sets of deluded folks really. I'm sort of depressive and have always worked really hard to overcome what I saw as my faults. What this will result in, and did for me in every arena, is that you look around and realize that all these successful people in your environment are truly mediocre but they just don't know it, how can they, they are deluded.. working with all these mediocre people is what drove me to trading really, I know I can excel but they will not give me much reward for it, trading otoh gives wonderful rewards to those that excel...