Penis erection is only 11cm, is it normal?

Patient's question:

Patient Gender: Hello,
I have a question. I'm 20 now, but I feel my penis is not big enough.
It's only 11 cm when erect, which makes me feel uncomfortable and very self-conscious.
I can't stand up in front of others. Why is this happening?
Why does the heavens treat me this way? Why can't I face it bravely?
These thoughts can only stay in my heart.
Recently, my penis has been feeling uncomfortable, with the skin flipping up a lot, which is very painful. Is this okay? What should I do?
Can my penis still develop? I'm only 20.
Also, have I had sex before? Can the penis still grow?

Doctor's answer:

An adult penis is 11-16 cm long when erect; in a natural state, it measures 7-9 cm, with a circumference of 6.9-9.4 cm. Specific measurements should be taken at a hospital. If the penis is too small, a penile elongation surgery can be performed. A man's penis length is related to race, family, genetics, as well as nutritional status during puberty, region, and individual differences. Generally, the penis primarily develops during puberty and does not grow significantly after this stage. If growth is desired, surgery to elongate the penis or implant a prosthesis is the only viable option. Medication-induced lengthening is unlikely to be effective. Additionally, an erect penis measuring 8 cm is considered normal.

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