I am totally, absolutely and completely left-handed (and left-footed). My grandad was obliged to write with his right hand, and ended up completely ambidextrous. I never got to play hockey or golf because, way back then, there were no left handed sticks or clubs. One of my sons is a lefty, the other two are right-handed. However, the youngest (who is a great footballer/soccer player) can dribble, control, run and shoot the ball with both left and right .
My piano teacher used to make me do studies by Ernő Dohnányi, because I couldn´t do that. More excruciating than the Algerian Hook torture!!lift my fourth fingers well over an inch without lifting any other fingers, which most people cannot do.