15cm = NOT short: 15cm = 5.9in is not short--average erected penile length is 5.1 to 5.9in and so I am not sure what else is really bothering you because yours is actually at the longer end of spectrum. I would suggest consulting a sex therapist or purchase book to read about sexual performance etc.. True sexual satisfaction requires more than just a long penis. Consult doc. Good luck.
Answered 3/14/2019
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