I carry one with me. If I see someone else wearing one, I'll put it on. I'm not really worried about anything myself, but I'll gladly wear a mask to give someone else peace of mind.
I wish everyone is like you. I don't wear masks outdoors anymore, but I still do in places like malls where there are tons of strangers. They can get pretty uncomfortable, but if it helps me avoid covid, the flu, or even colds then I'm all for it.