Hi,
Thank you for asking question on health care magic.
All need not attain the
puberty at the same age.
There are certain biological variations.
Puberty is known by breaking of voice,Axillary hair, Pubic hair, beards and mustaches (hair on the chin and
upper lip) increase in the size of testes,elongation of penis,erections and discharges.
Penis size is usually small and becomes big during erection.
You need not worry you are only 15 years old and you have got 3-4 years time to develop.
Hope this answer will serve your purpose.
Please feel free to ask any more queries if required
Take care
Dr.M.V.Subrahmanyam MD;DCH
Associate professor of pediatrics