The Erotic Highway
Dear PrayingToTheLoveGoddess,
Aaah, the blessings of youth! "My sexual ability is pretty much out of commission for a couple of hours." Well, I'll be a monkey's uncle! Dang! A couple of hours!!! Some of them grizzly bears on this here site can't come for DAYS afterwards...and you are worried about a few hours...egads.
But: If you have an issue with "finishing too early," my advice to you [specifically, since you asked] is to EXPERIMENT. Try masturbating about 5-6 hours [jeez, not days or weeks, that won't have any effect on your youthful body] before your date, and SEE WHAT HAPPENS. I can't swear that you'll last longer - yes, the body does have its own individual rhythm, but if you hang in there, you may catch up at around 40 or so. Seriously, though, if you want to "last longer," start practicing squeeze techniques, stopping-starting, TANTRA (East Indian sexual modality, very sensual and works great for some). It's good to start at an early age...except don't overdo it, or you could end up in the "I-can't-come-very-easily-anymore" camp, and then you'll be miserable for that.
Thing is, nothing at your age is cut and dry. That's why they call the twenties your experimental years. You're supposed to experiment. Perhaps that's not the answer you were looking for, but that's the way most men learn how to control their ejaculations - by fiddling around with stop-start-stop, squeeze techniques [putting a thumb right under the penishead and squeezing hard, while holding the penis with index and long fingers on the opposite side], pulling out, etc.
One great distractor is focusing on the female. Heck, go down there and munch a little. Most men de-focus on their orgasm that way. At your age, there's no risk of losing it completely. You can just revv and pull back without being in danger of erectile dysfunction [unless there's something physically pathogenic, of course.] Practice, practice, practice, eating her out, fingering her, telling her NOT to go crazy with the BJ, lest you should blow, SLOWING DOWN....all these things do help.
As to your disinterest in sex after the deed: that's completely normal. Some say it has its roots in evolutionary behavior - after you've impregnated the female, it's time to run away from either a)angry cave-husband whose wife you've sneakily tried to impregnate; or b) angry animal beast outside trying to rip you to shreds while you should be harpooning the poor critter.
Also, I don't know where you got this one from - maybe porno movies? I can guarantee that most guys do NOT "keep right on going with their same sex-drive" after orgasm and/or ejaculation. Most men's sex drive is "killed" after cumming. That's why you hear so many women complaining about snoring boyfriends/husbands, men who don't want to cuddle, men who just crash, men who are unromantic, etc. etc. etc. Many comedic moments in popular media reflect this behavior. IT'S NORMAL. Do not sweat it. Almost everyone is like you. If they say they're not, they're fibbing. Of course there are men who have been very well trained by their female companions to display affectionate behavior after intercourse - but up to a point. Most men just pass out, quite frankly. Or run back to the office if they're on "hooky hooker time."
Egads, could some OLDER, MORE MATURE gents on this here board give this young'un some helpful advice 
the Love Goddess
