Not caring does actually work. They call it schizophrenia. Just add some antisocial personality to completely distance yourself from your emotions.

Some of that is helpful. Schizoaffective disorder together with some borderline personality works well for me: you don't wanna completely shut out reality, your emotional responses.

But I doubt not caring, distancing yourself from your emotions, is something you can learn later in life, when you've already developed a personality. Psychopaths can be diagnosed at age 15. I think it might be rather apparent quite some years earlier. Maybe some of that can be simulated.

But it takes huge sacrifices, you should overcome lots of personality problems and it's a difficult balancing act.

I don't see how it's like BP-II. Borderline personality or antisocial personality, and SZ are not very much like BP-II, I'd say. Mania or mixed states tend to be more prominent, depressions might generally be shorter (the severe parts). So if you've reached that point, you might have learned it later in life. That's nice!

Caring less may be a good lesson for us all, just to function.