Apr 12, 2013· Hey guys! I have hit the body stage... I am, obviously, 13 years old and I weigh about 155 lbs and 5'2" tall. There is some muscle mass in there, mainly my arms and calfs. I know that I am a good 30-40 pounds overweight, and my girlfriend dumping me recently has given me the motivation to drop that. I don't necessarily look like I weigh that much, or at least I don't think I do.