Need help!

I am a 21 year old male, in great shape, lean, everything is great besides this. Need y’all’s help. So I didn’t rlly start getting sexually active with girls till I was 18, and my first 5-6 encounters stretched out over that summer were great! Rock hard, lasted long. Then I go off to a rather small college and didn’t get buns for about 2 years.
But then I pull this girl, we’re making out whatever probably for about an hour or 2, I couldn’t rlly get hard but whatever didn’t think nothing of it, then she starts to give me head and bam busted right away and was still fairly soft somehow and was like wtf that’s interesting I’ve never had this happen. Didn’t think to much of it, just like eh damn whatever, then the next time I get some play like 2 months later, I’m making out with a girl, and she’s grinding on top of me and bam same thing happens, busted while not even rlly hard, it then continued to happen in much similar ways the next few encounters. And has been kinda fucking with my head since.

When I had good sexual functions my very first few experiences. For about 6 months before my first time with a girl I would just practice long periods (weeks on end) of not ejaculating and just edging for usually around 30 minutes when I would masturbate the few months before. And it was rather often maybe couple times a week, if that helps some detectives out at all. And I don’t rlly know anything about all of this.

Thanks yall Preciate it