Ok so i'm nineteen and me and my girlfriend were virgins and we first had sex in october. Since then it's been been pretty normal. Like at first i didn't last long and i was starting to get better and just normal stuff like that. We don't have sex too often. (Like once or twice a week) mainly because we both keep it a secret from our parents. Well about 3 weeks ago she told me that having sex was too stressful for her because we always use a condom but she can't get on birth control because she's afraid her parents will find out. So i told her that we don't have to have sex as much because i love her and care about her. So for the past 3 weeks i was watching alot of porn and masturbating 2-3 times a day.
Well she got horny again and wanted to have sex so we did and it was really bad. Like we had it twice in 2 days and were gonna have it again but i couldn't get it up. Anyways today i decided that i was gonna try again and really try to make her feel good. I got on top of her in the front seat of my car and started goin at it. I felt like i had to cum so i slowed down then sped back up after a while. I ended up lasting like an hour and a half and i gave her her first orgasm. Well at least she said i did and from the way she was acting i sure felt like i did.
but i couldn't cum! after a while i figured she was done so i started trying to cum. but i just couldn't... what's wrong with me?