Help! Problem With Ejaculation During Sex

Hey guys,
I'm 19 years old and I have problem with ejaculation during sex. I lost my virginity a couple of months ago with my girlfriend and we have a lot of sex but I can never ejaculate and I don't know why. Typically when I'm masturbating it takes long to ejaculate 15-20 minutes and before I started having sex I though that it wouldn't take no more than 10 minutes to ejaculate. Ok so maybe some of you may already started guessing what the problem is but believe me it's not what you think. So some of you may think that I'm not physically attracted to my girlfriend but that is not true because when I think about her when I masturbate I ejaculate even faster. My penis is above average about 16-17 cm (6 and a half inches) and she is not wide at all, even when we start she is really tight and the first couple of seconds it hurts when I penetrate in her but then it gets normal and I start enjoying the sex. And we usually have sex for about 40 minutes and during that time she cums 2 or 3 times while I can't. We tried different positions, we tried oral sex, we tried more than 40 minutes we had sex for over an hour and wasn't even close to ejaculation. I feel like I can go for hours. For her it's great but for me it's awful because after an hour we stop having sex I start having this awful pain above my penis under my belly button and it doesn't stop for 20-30 minutes even sometimes it lasts for an hour. Like I said we tried different positions, oral sex, some of my fantasies, role playing but nothing works. The problem is not in her because she turns me on a lot, it's not the size of our genitals, it's not the way I fell around her because I'm comfortable around her, I'm confident so it can't be that either and I really don't know what the problem might be so if anybody has an advise please share it with me.

 

good, it gets old when people keep posting that. usually when people create an account to complain that they last forever during sex, they follow up by saying that they have above average dick size and make their girl cum repeatedly every time they have sex.

wait...

 

Ummm I really have this problem and I asked for advise I don't see what the big deal is. If you can help me please give me an advise if you can't then please don't spam. Simple.

 

Hey sgng, I think you have a condition called delayed ejaculation. Do you masturbate a lot? Is it very intense? Vagina is not as strong as your hand. Therefore, the sensation of intercourse is not as good as the one of masturbation. Try to masturbate less temporarily. If you can, give up masturbation entirely to see if it helps.