Late puberty or something more?

Patient : I am an 18 yr old high school male and i have been dating a girl for about 4 months. I am 6'1 , 185lbs. Most of the stages of puberty have cone and gone. Growth, hair growth, voice change ect. However the size of my penis has stayed generally the same. This is quite embarassing in te locker room and in the bedroom. Worst of all when i try to have sex, it doesnt stay hard and barely fills a condom, making the sex unpleasurable. Please, if theres anything at all you can tell me, i would REALLY appreciate it!
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