Most people put the foot forward that is the most stable. In surfing it used to be considered "goofy" to put right foot forward (for reasons unknown to me), so many learned with left foot forward even if it felt awkward to them. There is no longer any social pressure to do that, particularly now that the GOAT surfer -- Kelly Slater -- is right foot forward. I surf, skateboard, wakeboard, snowboard and ski with my right foot forward.