You need to think about the physical and emotional risks you will be taking.
Puberty is the time when a boy's body becomes a man's body.
It is a time of much physical and emotional growth.
The first thing your healthcare provider may notice is an increase in the size of the testicles. You may get embarrassed by it, but remember this is something that happens to all guys and it usually doesn't last more than 6 months.
The first thing you will probably notice is pubic hair growth. After some time the hair starts to curl and begins to spread in a triangle-like pattern. Testosterone causes muscles to get bigger and stronger even without weight lifting.
Hormones in the body are responsible for the changes in your body.