Sort:  

I have met with many people, who think beyond the limit. keep thinking about the things that never exist and they hurt themselves for those things !!!

Indeed, some people do that and some don't really think at all.

Exactly, that is why I'm relating it to some kind of disease, a mental disorder.

relating it to some kind of decease

As I said before, the word is disease, not decease. Deceased means dead.

Oops. sorry, My bad, I didn't get it before. correcting.

No worries, I was just letting you know so that you knew for next time.