What should I do if a man has a small penis?

Patient's question:

Detailed medical condition and consultation purpose: Phimosis, purpose to be cured
Duration of current illness and persistence: To date
Current general condition: Phimosis
Medical history: Honestly, since childhood, my penis has been very small. Even now, after development, there hasn't been any significant growth, and it's much smaller compared to peers. I don't know if it's congenital phimosis. I've never visited any hospitals for examination before. Could you help me understand what the cause might be?---Thank you
Previous diagnoses and treatment history and outcomes: None
Auxiliary examinations:

Doctor's answer:

The normal length of the penis in adult males in our country is 12 centimeters at its longest in a normal state, 3.5 centimeters at its shortest, with an average of 7.1 centimeters. When erect, the longest length is 18 centimeters, the shortest is 7 centimeters, with an average of 12.4 centimeters.
The development of most male reproductive organs is definitely within the normal range. There are only two situations that can lead to true micropenis or small testicles: one is a problem with chromosomes, and the other is severe endocrine issues. In these cases, the gonads do not develop, and neither do the primary or secondary sexual characteristics—they are a unified condition. Only in such situations is it considered a developmental issue, and such individuals are extremely rare. In other words, the vast majority of people concerned about this issue actually fall within the normal developmental range.
For example, some people may see certain metrics mentioned in information or advertisements, such as claims that a penis size should be above 15 centimeters to be considered normal, without specifying whether it refers to the flaccid or erect state. Some may think 15 centimeters is far too small, but in reality, a flaccid penis of 5 centimeters is normal, and an erect penis of 8 centimeters is also normal. The standard is actually quite low, not as exaggerated as some advertisements claim. Therefore, this is a misconception, and many people exploit this misunderstanding, suggesting that the larger a male's sexual organs, the better his future sexual life will be. This is, in fact, a misconception.
Women's sexual satisfaction is not significantly related to the size of their sexual organs, and the development of most people is absolutely sufficient for sustained sexual activity. It is also impossible, as some advertisements claim, that they exaggerate the effects of their pills.