No they don't often call me negative, but that's probably only because:
1. I keep a lot of my negative thoughts to myself, or disguise them as humorous one-liners, and I often put on a bit of positive social gloss when I have to socialise with people I don't know, I try to keep my demeanour cheerful.
2. The people I'm currently close to are too nice to criticise me like that.
I think Olympiadis is right about this "optimism bias," I tend to see myself as a depressive realist, which says much the same thing except that it medicalises me instead of medicalising the society that can't face the truth.
https://en.wikipedia.org/wiki/Depressive_realismI'll leave you with this to ponder....