I want you to see what the research has to say, and if you think your penis is too small to grow, don't give up!
Puberty, and the changing of your penis size, can often happen before you start to see noticeable results on your testicles. For the first few years, your testicles get bigger and grow faster than you think. Your penis grows so large you will never be able to enjoy sex with someone. Some people see a penis size of 6.5 inches around puberty. This can be a big problem if you want to become sexually active. You may not want to have children!
The first 3 years of life are important for your genitals because you get the ability to move your penis out and about. This also starts the process of learning how to be able to have sex and ejaculate. By the end of the 3 years your testicles will have grown to their final size. These are the only three years that your penis has any real sexual capabilities. The other 2 years are used to build and repair all the body parts that are important for a penis to function properly. After these 3 years, your penis will no longer be a 6.5 inches.