Hi.
I was not exactly premature, but I would sometimes cum before I was ready, or to uses one of the definitions in the literature, unexpectedly. I basically decide I was going to crack it no matter what. Whenever I had sex, I would just slow down when I got too near the point of no return (PONR). Then, when the urge subside, I would speed up again. Sometimes I would even have to stop and pull out. I got complaints from the person underneath me! But I was on a mission :D
Eventually, I achieved almost total control. I say almost, because it’s still always possible to get carried away, but that’s probably a good thing, and can actually make the woman think she must have blown your mind if you can normally last - no matter what she might throw at you :)
I have communicated with quite a few guys on this subject, both in threads, PMs and in r/l. A common theme that comes across is that most of these guys, especially the younger ones, are in a hurry. The standard advice given by sexologists on overcoming p.e. is to become aware of your arousal level. If you watch very closely, the next time you have a p.e. experience, you will see that ejaculation comes unexpectedly. It comes “out of the blue” because, you are not fully aware of your arousal level. As you gain awareness, you will naturally adjust your tempo, and for most people, that is a enough. I could write more, but that is the gist of it.