I am about to be 12 years old in September. I am in the 7th grade, but there is just one problem. I am 90 pounds. My doctor said that I am not underweight, and I am perfectly healthy, but I think that 90 pounds for a 7th grader is insane! I am 5' 3'', and my friends always call me toothpick, skinny mini, stick, little, and the list goes on and on! I have tried stuffing myself, but this doesn't work. I have tried being a couch potato, and it didn't work. Is this normal? What should I do?