Try to have a partner that will be compassionate about your issues and try this:
the number system is what I have devised from reading books on tantric sex. Think of a 10.0 as the height of the orgasm, and a 1.0 as a completely flaccid state with no sexual stimulation. The numbers 1.0 - 9.9 can be repeated much like riding a wooden roller coaster. The trick is to learn what a 9.0 feels like and to train yourself to respond to it.
Start intercourse and do "normal" things until you reach a 9.0. Immediately stop and let yourself relax to a 4.0 - 5.0. Once you are there, resume thrusting. Repeat this cycle until you are only able to relax to about an 8.0 state. At this time, you should switch to other types of sexual activity. Let your penis become flaccid and try massages, oral, or other types of sexual activities that do not break the mood, but divert the focus from your penis. After a few minutes, start intercourse again and repeat this cycle. The key to this is the repetition and restraint. Over time, you will be able to get to a 9.1, 9.2, and even to a 9.9 (like I can) before having to stop.
Intercourse in itself feels great! The inner walls of the woman’s vagina are very inviting, warm, soft, and the emotional and psychological effects of sex are unmatched; however, the orgasm should not be the "goal" of sex. The whole experience should be the focus, not the end.
When I was a "newbie" (actually from age 16 - 19), I couldn't last more than 10 min on a good day. I met a girl who was very inexperienced and we learned together through books and experimentation. I devised this method and now I can go for hours at a time, with getting to a 9.9 and actually have multiple 9.9 level orgasms. The final 10.0 actually feels more like an 11.0 now. Try this and feel free to pm me for any explanations or further details that you need.