First of all don't pay attention to the calculator on this site. I'm at the 96th percentile of my height and age but I am perfectly healthy and I'm at a good weight for my height (5'10", 157lbs...my BMI is 22.6) so DON'T LISTEN to this calculator. I think you should see your doctor about this and he/she can definately help you out. They won't ridicule you or anything doctors want to help people so don't be afraid! You can do it! :)