i think alot has to do w/ puberty, i wuz like u at age thirteen, i dropped 10-20 lbs easily and didn't do much , thats because i wuz still growing. Its gonna be a bit harder, but u can lose the rest by excercising everyday, and eating healthy. Im 5'5'and a about 138. My goal is to weigh 120, and be a size three. anywayz, laterz