How big are your feet?
It doesn't really matter what size bindings are on the board as long as your toes aren't over hanging enough for you to drag. So basically the board can be to narrow, but your bindings are going to be to big for the board.
"When I do good, I feel good; when I do bad, I feel bad. Thatís my religion." - Abraham Lincoln
Moral of the story: If your going to rob people, wear a diaper.