"Now... does anyone think being a pessimist or "negative" inherited? Or taught? "
Taught. Between people and the environment, we learn how to react, how to behave, even how to think for ourselves...
I "learned" that everything bad really was going to happen. Why? Because for 2 years straight I have endeared more than anyone should have to. I might be young but I swear there was 10 years worth of crap crammed into the short 2 years. I went through "way ******* below the poverty line", went through "hello debt!" and also "IOU everything"... Sided with "Hobby/life goals crashing down to the rocky waves below the crumbling cliff" topped with "Every relationship fails, so stop trying." And each of these had a crap ton inbetween that I swear would cause a sane person to collapse to their knees.
As for which I am; optimist or pessimist... I am definitely leaning towards pessimist. But as described above, because of all the crap I went through, it became the norm not to expect much. I already have the pessimist planning the "just in case it craps out like it has before (over and over....)." I am optimistic for other people, more than myself.
As for the thoughts on "you cannot be an optimistic person AND lonely..." Sure you can. A person can say to themselves, "I am going to meet someone special! I'm going to own my own business! I'm going to have good friends!" And so on... But yet, they may not have that? They may not end up having someone to love (or who loves them). Or own their own business, or have many (or any) friends. Yet they still look for that light in the darkness.
"So my question is: how can a person who love laughing and who laughs often, be a pessimistic, and always feel as if everything bad will come?"
Being caring and loving to laugh, does not automatically mean "optimist!!" It's just how the person is. They want to feel happy, loved... Love to care, and love to love. But they can still feel afraid, alone, unsure, or overall as a pessimistic person would.