The drinking could be major part of it. Alcohol is a depressent and thus it depresses your physical responses. Lay off the booze and see what happens.
Regarding your size, you are a tad under average, but not by much. Maybe some of the ladies who have made comments have only been with larger guys, or they believe the myth that 6" to 7" is average. Maybe if you could simply finish in a reasonable amount of time, and if you used oral and manual techniques on them with good results, they would not really care about 5". Right now, if you go on and on, they may be getting tired and would simply for you to it. This may be the true source of their negative comments.
You can read comments in this forum that most ladies think that even 4" is quite adequate, if you have good techniques.
As for enlargement, the surgery is expensive, very risky and very often fails to provide good results. This is why so few doctors do it. The extra inch you might gain would probably not make all that much of a difference anyway. Some men claim the penile exercises (jelquing) help, but other than possibly giving a stronger erection with more stamina, few people report any significant increases in size.
I presume you are wearing condoms, and these do cut down on sensitivity. Can you mange to ejaculate by masturbation? If so, introduce this into your lovemaking. The natural skin condoms provide more sensititivity, so that might be worth trying, but these don't protect against viruses like HIV.
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