to back up what others have said, it's habitual; that means you can change it, because it's simply a pattern of thinking/behaviour, not something innate to you.

to back up what others have said, it's habitual; that means you can change it, because it's simply a pattern of thinking/behaviour, not something innate to you. Changing habits is a kind of hacking that Atomic Habits (book) is a great introduction to, but as a first tip I'd say that when you notice yourself being overly negative, try to consciously counteract it with a positive or grateful observation. In any situation you can find something negative (as you already know), but also something positive, so try to rewrite your default behaviour to look for the good rather than the bad.