Why is my penis so small?

I am fifteen years old and weigh around 185 pounds. My concern is that when My penis is limp, It is very small, not even an inch. However, whenever I have an erection, my penis is around 6 and a half inches. I wanted to know if there is a reason for this? And if I could somehow increase my penis size without... show more I am fifteen years old and weigh around 185 pounds. My concern is that when My penis is limp, It is very small, not even an inch. However, whenever I have an erection, my penis is around 6 and a half inches. I wanted to know if there is a reason for this? And if I could somehow increase my penis size without stimulating drugs?
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