Why is cumming too soon such a big deal for guys?

WOW dude it’s the third post in like 5 min in this sub that i can TOTALLY RELATE. Yesterday i’ve decided to stop watching porn and masturbating. I used these stuff so i could last longer in bed. Ever since i’ve lost my virginity this was the most concerning thing about sex and i feared it A LOT. Once, i was having sex with a girl who was “that girl every guy in your age wants” and i came in like 8 min because i was in nofap september and i almost cried in front of her while she was saying, hey that’s ok, it was great and we only did it once, let’s try again later. Fast forward i was dating the girl today is my gf and duuude she is so hot and i was so crazy about this shit i started jacking every day so it wouldn’t ever happen again. So yesterday i decided going on a nofap and no porn challenge and i chose to talk to my gf about the time i last in bed (without masturbation i last something like 10 min) and she just said “i really don’t care about it at all, girls usually take longer to reach an orgasm and that’s ok” so we talked about trying to have her reaching it before (even though she already said she prefers penetration to oral itself) and that relieved me A LOT. This reddit is helping me A LOT to understand my relationship and how the girl’s mind is different to ours.

/r/sex Thread