Penis enlargement and increase sex time

Patient: I’m 18 years old.My penis size is under 3 inchs(when hard) and my sex time is also short. Evrytime after four or five times, i fallen. It’s getting me worry day by day. Girls are avoiding me. Plz help me doc to enlarge my penis size to atleast avearage and make me strong. Is there any hope for me?

Doctor:

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