Gender is determined at the genetic level. "Feeling" different does not and cannot change that.
I think that might be news to some people. Maybe they need to go back to HS Biology.
Actually, there is no proof that gender orientation or gender identity are determined genetically. Recent thinking is that hormonal influences in the womb may have something to do with it. I agree that this guy has a problem, and I sympathize. I just don't see why society has to turn itself upside down to become as confused as he is.