it depends how tall you are. you could be 5 feet and weigh 100 pounds and that is totally normal.ecspecialy around puberty.
Health specialists often use a measurement called "body mass index," or BMI, which is a value normally around 20 or so which basically tells you how much you weigh compared to how tall you are.
Such formula can be found here:
http://www.whathealth.com/bmi/formula.HTML
it is a rather simple one, and can be done by pretty much anyone. We used it once in math class to help learn rations and division.
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