If your 17 male (are you?) and only 137 that's pretty damn small. I was 137 when I was 12. Now I have always been big, but I was almost 100 pounds heavier than you, and not fat at all, I plaid pac 10 football mind you. But I was 6 4 by age 19 so that is part of it obviously. I ended up like 245 and now with football over I stay constant at 220