FAT MAN SURFING

I don't exactly have the typical surfer body. I am about 6 foot tall and about 215 pounds. I have surfed once on a flat day at Virginia Beach with reasonable success. I rode a blue rental board that was the better part of 9 feet. In the flat it felt at times the board may not be buoyant enough. I'm betting with a decent wave the buoyancy changes dramatically?
I have a muscular build and do not want to lose that just to be light enough to surf. Is there any hope.
I have a muscular build and do not want to lose that just to be light enough to surf. Is there any hope.