Hello,i m 21 y.o ,male and I ve been a virgin until recently. I regularly masturbate almost every day(with the help of porn sites and moveis), I get regular erectioins when I m alone.Otherwise, I m shy, withdrawn and introvert type of guy, thats why I havent engaged in sexual relationships so far. I do not drink, do not smoke, don t do drugs, don t even drink coffee I have pretty tight and conservative parents. I m under stress moderatelly and I m not physicall active that much. Besides that I lead failry heathy lifestyle...or at least I try to.I have met a girl via dating site, met her in the real world and after a while we have finished in the sack.I got and erectioin, penetrated into her, but after some time I lost the erection. Then she gave me oral and again I got an erection and she had to do it couple of times because I lose my erection after awhile....I was confused as well as her..It lasted about an hour, and I could not have an orgasm, genital intercourse is not enough for me I got used to my hand probably.. Did she get orgasm I m not quite sure.. And finaly I had to finish myself manually.. So my problem is I cannot hodl my erectioin during the intercourse and cannot have orgasm during the genital intercourse even if I have an erection, only masturbation works for me...We had sex couple of time s after hat, but same thing happed again and again That is frustrating as you can imagine, because otherwise I have an erecions when I m alone and even in socailly undesirable circumstances. I masturbate almost daily and get erections and orgasm, but my pal betraded my when I needed it the most :)my question is:Is this erectile difunction(ED)?If so, is the cause for this becaus I m still a novice in this, that was my first time in the world of sex, I was nervous, or because I m introvert or combination of al of these aforementioned?Would you recommend using penis ring around my penis shaft?And what can I do, besides that to correct my problem (if it is a problem?) in natural way preferrably?thank you,Kind Regards