I am a very happy person. I have very few friends, and the ones I do have aren’t close. I am an athiest and I am kind of an introvert – so it can’t be any of the factors you mentioned.
I really think it must be a brain chemistry thing, because I have had just as much crap happen to me during my life as anyone else, but I am still basically happy.
Another happy person I know is the music teacher at the school where I work. He has been battling pancreas cancer for a decade.
I could say that the reason I am happy is because of my four children, my two grandchildren, a job that I love and financial security. I could also say that this music teacher I know loves his job, his family, and yadda-yadda. But the fact is, even if one of those things went south, we would probably still be happy people.
And on the other side of the coin, I know some people who are always unhappy even though they have more reason to be happy than I do. That is why I say I think it is either a frame of mind or just the way my brain works.