Have only had an orgasm once

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Hey. So I've been masturbating since I was like 10, and now I'm 19. To my memory I never actually been able to orgasm, until just the other night. This is the only time it ever happened, and it was kinda random and caught me by surprise. My question is, am I doing something wrong? Whenever I've masturbated, I'd either lose interest and go soft, only be able to pre-cum, or go for really long (Like, 30 minutes or so) always feeling like I'm ABOUT to orgasm, but never actually being able to. Even after the other night, after a half hour or so, I decided to try again, but I couldn't orgasm, even though I had done it just a bit before, and I haven't been able to since. I'm just confused, why that one time, and what did I do differently to make it work? It definately wasn't the intensity of stimulation, my dick has felt way more tingly that it did that one time, and still not orgasmed from that. When I had it, like I said it was surprising. I didn't feel like the amount of stimulation was even close enough to pre-cum, but then all of a sudden it happened. So yeah, like what do I do? Anyone else like this?