Do I weigh to much :( please help!?

I'm 13, 5'7, 27inches round my waist and 30inches round my hips. I'm only a 34A cup, and I guess I'm pretty strong I have a 6 pack :/. I used to weigh about 110 and that was only like 7 months ago and i jus got weighed at the doctors and I weigh 130! D: my mom said it's jus cuz I'm so tall and my bones are big or something, but I don't think I should weight this much :( I eat healthy and very active too... Should I go on the water diet or jus not eat so much? :( plz help