is there any natural stuff I can do, or take to improve performance, and make me last longer? like foods I can eat, or vitamins I can take?
There is a multitude of things that can be done. Start with the basics, a good diet. Not sugary junk food but good healthy food. Vitamin supplements are good too but no substitute for a good diet. You may be able with some practice be able to control your orgasms but that takes a lot of self control. However at 18 you should be able to reload pretty quick and usally last longer the second or third or fourth time (Oooh to be young again). Another simple trick is to wear a heavy duty condom which reduces the sensations on your dick and also makes for easier clean ups. Along the same line is a cock ring but practise is involved, otherwise it can be painful and potentially harmful. There are nasal sprays on the market which promise to extend sex but I have had no experience with them, so can't really say wether they work or not. If you have a real problem with premature ejaculations you should get proper medical help to fix it. If you still have props with premature ejaculations then you may want to stop just before blowing, if she complains about that you can use toys or oral to keep her going while you calm down a bit. Usally bringing yourself close to orgasm several times before finally blowing the load makes for a more intense orgasm. Most women love having a man ejaculate a big load into them and splattering their insides good and proper.
I cum fast sometimes too, but I also usually get hard again very quickly after cumming (5 min, sometimes it only takes 1 or 2) so this is what I do: Have her blow you 'till you cum. Relax/cuddle a few minutes then get her to stimulate you again with her mouth or fingers, and stick it to her. Voila.
What I'd recommend is don't masturbate as often. If youre like most 18 year old guys, you probably flog the dolphin while looking at the Internet or Playboys or something. Youre creating a mental orgasmic trigger that goes off with visual stimulation. And its reinforced every time you punch the munchkin. Women are much more likely to be mentally stimulated, unless youre lucky enough to get a girl who is visually stimulated (youll be a perfect match). In order for you to last as long as it takes for her to orgasm, youll have to start thinking like she does. This doesnt mean that you shouldnt beat the bishop if you see a picture of a really nice set of tits or whatever. Just be a little more selective about how often you do that.
Yohimbe - it's actually tree bark, but it boosts testosterone levels. my man used to utake it once i a while. you can get it at any herb store or GNC. they (GNC) actually make this stuff called Cobra, which the main ingrredient is yohimbe, plus other masculine(?) herbs. it's also good to take before a work out, gets you PUMPED. i even used to take it once in a while when i had lots of yard work to do this stuff WORKS!!