I’m American, and I was born in 1970 to a Midwestern, lower-middle-class family (if it makes a difference). I have always held my fork in my dominant (right) hand. When I cut meat, I switch to the knife in my dominant hand, then switch back.
Watching a lot of cooking videos as I do, I notice that the cooks and their guests almost exclusively hold their knives in their dominant hands, even children. So unless the overwhelming majority of YouTube cooks and their families & friends are left-handed, I’ve been doing it wrong for ~five decades.
So what is your nationality and in which hand do you hold your fork/knife?
Poll to follow.