Its amazing how much we grow over the years. I have pictures from 16 and 17, when I was wrestling at the time. I had a well developed upper body, but I has sticks for legs (probably around 18 inches). As a teen, I was certainly a lightweight. At age 14 I weighed a massive 112lbs. At 15, I tipped the scales at 125lbs. At 16, I approached 145lbs, After graduating high school, I weighed 162lbs.
For anyone who is just starting out, be patient. . . .it takes years to develop a body.