what is the average wait of a 13 year old girl that is 5'6

your *average* weight is 132-154, depending on your bone structure and physical maturity. When I was your age, I felt the same way about myself and finally "filled out" around 15..I slimmed down without changing diet or exercise just because my body became physically more mature. If it is a serious concern for you, try exercising a little more, even if that just means walking for an hour every day, and eating less sugars/fats. You don't have to fully change your diet because at a young age, it is typically easier to take off a couple of unwanted pounds. I really think that you are probably seeing yourself as bigger than you actually are and that in a year or two you'll fill out and slim down. I really hope you the best. :)