Hello, if the penis is only 2cm when it is weak, it is really small. It is absolutely normal to have 10cm after erection, but it is really small.

First, 17 years old, male sexual development is incomplete, and it is possible to continue to grow;

Second, even if it no longer grows, as long as it does not affect urination and normal sexual intercourse after erection, you don't have to care too much about the size problem;

Thirdly, it is suggested to exercise more, especially strength sports, such as playing football, basketball and running. , promote androgen secretion;

Fourth, it is recommended to avoid frequent masturbation (below once a week) and pay attention to personal hygiene.

In addition, don't believe that the so-called "penis secondary development and enlargement" drugs on the Internet are harmful to your health, and don't try penis enlargement surgery before consulting a regular hospital doctor.

I wish you the best of health!