15 years old with small penis

Hey, i'm 15 and have an etrememly small penios, non erect it is 2 inches and erect it is 3.5-4 inches, i am not confident with the size, and my balls sometimes are saggy and other times tight and look like they have been bruised, i have never ejaculated either, it is really getting to me, can someone please help. ???

At age 15, you're not done growing.

A man's scrotum goes through changes with temperature and humidity. It is normal that it is saggy one time and tight another.
It is nature's way to attempt to control the temperature of the testes for optimum sperm production.

You are completely normal. Wait another four years and see if you aren't more satisfied with the appearance of your genitals.

Relax.