I love this competitiveness and never letting go of a loss, probably not for mental health but I think it gives us mere mortals insight into the mind of a world class competitor. If I let losses eat at me like that I could never compete as I had a whole lot of losses to contend with, some very painful.
I( reminds me of an article I read years ago about Bob Gibson, the great St Louis Cardinal pitcher, who a reporter asked if he was over a world series games he pitched and lost many years after he retired. Gibson got so mad at the reporter for asking what he considered ridiculous question, as the the loss still hurt him every bit as bad as the day happened