Considering how as teens we want to get ourselves off "Quickly" we develop a pattern.
Add to that the added incredible stimulation of a real partner and becoming more then a three minute wonder takes some effort.
Me? I hope there are better methods then what I did and I will hit Google for you for a start. What I did was to bring myself off about one hour before, because the 2nd ejaculation usually takes more time. And a small drink one hour before so the depressive effect of alcohol tends to help - Important for it to be some time before, rather then just before!
This one includes the use of modern drugs - however it also discuss other techniques
http://www.merck.com/mmhe/sec21/ch240/ch240e.html
Wikipedia looks like a very good source for the information
http://en.wikipedia.org/wiki/Premature_ejaculation
http://ezinearticles.com/?Delay-Your-Ejaculation---Simple-Tips-to-Help-You-Last&id=1540867
A link from that article
http://www.squidoo.com/pe_treatment
Seems that searching Google comes up with a lot of links where people want you to buy a book or other product for help - I suggest a review of the free information first because this is such a common problem and complaint -
Me? Can go as long as any gal wants and on occasions I find myself going over the edge because long ago I decided never to cum until the gal in my life had come first. Sometimes I just decided that it was enough "fun" to just let her have the multiple big O's and not let myself come. I call it going beyond the edge. Besides it means I am ready to go the moment she decides to go again.
I sure have my share of embarrassing situations as a young teen.
Only "once" since that time have I ended up coming too soon and I blame that on pot and will NEVER try that again before making love. Well perhaps with the right partner -