I think my feet are confused. My right foot is definitely dominant; I use it to haul myself up while hiking, and unfortunately this means it is about 20% stronger than the left. I have the right foot forward when coasting usually, as well, though I switch it up for entertainment value. But I walk, carry and mount on the left side of the bike, and also unclip and put my left foot down. I am pretty sure the leading / mounting from the left is due to horseback riding though.

I should have known the clutch pedal was on the same side of the driver in all cars... I've driven in England.