If you're talking specifically about premature ejaculation, rather than hormones more broadly, forget food, paleo, etc. It all comes down to your imagination - what you are thinking!
Forget everything your 20 year old bros told you, forget everything (OK, most, not everything) you've seen on youporn, etc.
You need a good, nearly equal-aged, equally experienced or inexperienced woman so that you grow and learn together. Sound mushy and overly sentimental? Bull$h&t, it works.
I found in my late teens and early twenties when I was getting down like a madman (I'm 32 btw), albeit with one truly fabulous woman, that I would let nature take its course: forplay, imagination going crazy etc and get a good pace going - feeling eachother out, going slow and steady, smoothness and gentleness and kindness should be on your mind. Anyhow, do this natural path till you yourself are, in your mind, like sh%t, i'm getting ready to rock and roll here....
At that point, and I know this sounds silly like something you hear in movies, but I'd actively think about anything unsexual: taking out the garbage, zombie movies, maternal relatives, beating your buddies at Battlefield online - anything other than the incredible sex you're having. I swear to god I remember right now many many times thinking "taking out the garbage, you're taking out the garbage" - like some kind of mantra!
Ah good good times. Anyhow, enjoy enjoy enjoy what you're up to right now is what life is all about! Don't let society, your parents, etc suck this stuff out of you! Good food, sleep, sex - that's the key!
PS: this warrants something greater than a PS but: always always always put the female first in all your sexual endeavors. I mean it. Always always at least try and get them to orgasm first. It ain't always going to pan out that way but always shoot for it. You will get so much back in return - both sexually and just person-to-person as you make your way through life with this person (however long it lasts: one night to one thousand nights).