You may start to notice secondary sexual characteristics such as pubic hair, voice cracking, breasts(for girls), hip widening(for girls) etc. Facial and body hair may follow but this usually takes a few hears for boys. You may also notice that the opposite sex is a bit more interesting than in the past and you start wanting to make opposite sex friends or have more exclusive relationships.
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you start to have hairs down below and armpit hair and your voice starts to go deep
You will gain height and foot size rapidly.
well, I do think that his voice has change a little bit but not as much as another kid, you know maybe he is hitting puberty
You are just hitting puberty in an earlier age.
There are no tricks of gritting puberty. Puberty is something everyone goes through in their own time.
High. Puberty can start at age 15 or 16, too.
yes
The endocrine system is responsible for a person going through the stages of puberty.
No. Everybody hits puberty at their own rate, so you and your twin could hit puberty at entirely different times.
You can get erections any time. Hormones do it to you.
Hitting puberty at the age of 17
It means you have hit it, yes.
No because you're not even close to hitting puberty.
No. And there is no too fast. It has been going on before you notice it and the body does things in it's own pace. Puberty is not dangerous.