In my school days I was a left-winger. I held pens awkwardly. Sometime around the early 1980s I went from left-wing to right-wing (probably from breaking left wrist on my home-made billycart) and stayed that way. I can still write fluently with my left hand as well as my right. Can't imagine at all using a camera with left-side controls. Oddly, the film in my pinhole camera is loaded from right to left, and the leader isn't tapered. It strikes me as an alien concept and I do find loading this way awkward and sort of unnatural.