I'm using a throwaway but I've been an avid lurker (and sometimes poster) in TRP for years.

I'm in my early 20s. For most of my life I was undersexed, lived in a small city in a relatively conservative country and didn't have much contact with girls outside of school. Lost my virginity at 20 to my first girlfriend; I had PE issue with her, in the first round I would come in a matter of minutes. After only 4 months we broke up and I found TRP. Some years have passed, my n-count is now 5, fooled around with a couple more. Still bad but not too bad for guys my age in my country.

In particular, I had a fuckbuddy for a couple of my months while I was studying abroad. She was hot, probably 8/10, and fucked like a pornstar (she was a huge tinder slut, maybe even a nympho). The first night I fucked her like a pro three times. The subsequent times I sometimes lasted less than I wanted the first round, but I would more than make up for it in the next rounds and had lots of sex marathons. PE was overall not a problem with her. The penultimate girl I fucked was really bad at sex and I couldn't even finish!

Recently, three months after my last fuck (I've had longer dry spells anyway) I had sex with a girl and I didn't even last 5 minutes. This was pretty embarassing; even more so when ten minutes later we had round 2 and I lasted, again, only 5 minutes, something that had never happened to me before (usually second round lasts forever). I had jerked off the night before and some hours before. The crazy thing is she was a very bad fuck: unbelievably shy, didn't even blow me, laid there like a starfish. Plus, I fucked hotter girls in the past. Then why the hell did that happen?

It's been a few days and this has been fucking with my mind since. I am good at fingering and oral but we all know that PIV is crucial, if anything for the dominance aspect in it. I thought I was over PE after the positive experiences with my fuckbuddy and instead I had my worst performance, twice, with a bad lay. She texts me often and the day after she told me she had fun the night before and we should do it again. But this is beyond the sex itself in which I performed very badly.

I have read the Sex God Method and successfully applied it in the past (e.g. fuckbuddy). I lift 3-4 times a week. I eat healthy. I don't do drugs. I refuse to get drunk every time before sex. I have a very high sex drive (with my fuckbuddy I did it 10 times in one day and a half).

I know this issue is mental since I have performed well in the past, but I can't stop thinking about it, which as everybody knows just makes it more likely that next time it's gonna be bad again. What tips do you guys have? I'd like to hear especially from guys that had it and successfully beat it once and for all. I'm thinking of buying a Fleshlight STU to be more accostumed to the feeling, even though, again, the issue is probably more mental. I know about Kegels and Reverse Kegels but I feel like they are more placebo than anything, since millions of chads don't even know what they are and they have no problem fucking like studs.