Sexuality has become a major source of stress for you. Man, you have to perform, give orgasms, satisfy your partner. What was meant to be pleasant and enjoyable has become heavy and stressful. It is true that porn is responsible for a lot of this, because overuse makes you believe that it is real. This is when you compare yourself and the feeling of not measuring up intensifies. All this is fueled by the comments of friends, by advertising, by TV shows and by the expectations of your partner. You try to conform to an image that doesn't fit you. You manage to play this role for a while, but sooner or later you won't be able to. What's not pleasant will eventually become unpleasant or too stressful, and the erection will disappear.
Men are experiencing impotence at a younger and younger age. It's time to put some pleasure back into it all, because we have to face the fact that sexual performance does not meet the needs of either the woman or the man. For you, man, even if you take some pleasure, you feel alone in this relationship. Unconsciously playing the character of the super-performing lover, the one who wants to live up to it, makes it so that you don't become one. Why not? Mainly because you are disconnected from your own pleasure, your senses and your real needs. Your real need, man, when you make love, is to feel the love and attention of the other person. What you are looking for is to be in communion with the other. This is the need of every individual.
To connect with the other, you must first learn to connect with yourself, your senses and your own pleasure. So get out of that feeling of not being good enough. You don't have to stay there. You are fantastic, man, and you have so much to offer.
Find out who you are, come and experience it.