When I was 14-15 I had sex with my GF for 10-20 minutes at a time, ALL the time, and I would make her orgasm 5-10 times. I was put on Prozac (and Adderall) at 15 all the way until I was 18 (and smoked heavy amounts of marijuana, and regret it). Now, at 20, I have had sex with 2 other girls since and I failed miserably both times, once at 17/18 and once at 20. By "failing" I mean I could barley get an erection, and IF I got one it would be only half an erection and I would ejaculate in a minute or less. It was so embarassing because the girls didnt get ANY pleasure...
I read prozac causes "gonadal atrophy" in boys causing "problems in puberty and sexual activity later in life"

I feel like prozac and adderall fried my body, brain, and sexual organs, as I hit puberty very late...
Did this happen to me? My penis is just under 6 inches and thats partially why Im so scared to have sex... because Im worried Ill be too small to please the girl and they will be used to 7+ inch penises... Am I too small?
How can I get back to be able to have sex the way I did at 14-15? I feel like I wont be able to have sex ever again... I have turned down quite a few girls that I almost loved because I was too scared to have sex with them because of my sense of non-masculinity...
I need help; I would appreciate any advice, info, or experiences from yall