It may be that "mental health" may be in the eye of the beholder.

Right now, and for many years in the past, I would say that my "mental health" is poor -- mostly things that would be classified as "depression" so that, to many beholders including me, I don't function as well as most other individuals in my physical situation. If I were happy and content being by myself and "eccentric", maybe, then my mental health might be fine for me and not really anybody else's business if I weren't bothering them. I think that's what I may aim for, at this point. Perhaps a "mentally healthy" change of outlook? We'll see.