Actually, Punk, I wouldn't tell you to tone it down.
Here's what I would tell you: sex should feel good on all levels -- physically, emotionally, ethically and intellectually. If the sex that you're having is okay with you in all those ways, and you're being responsible in the way that you practice it, it isn't my place or anyone else's to judge you on how many partners you have or how often you have sex. The only person whose place that is is you.
Perhps right now, to save yourself the frustration and the feeling that you're constantly screwing up, you should only get involved in more casual relationships where you can make clear you do not want exclusivity.
I'm going to take a wild guess and you can make another post or poke me in the nose if I'm wrong, but I'm guessing that what's got you so excited isn't the sex, but the attention and the feeling of being desired that it gives you. And that's okay, as long as you're really looking at that.
Sexual urges are pretty easy to take care of, you masturbate. And truth be told, if they are ONLY physical, that is the best way to take care of them when it comes to respect for yourself and others.
Lastly, intercourse isn't only sex. Oral sex is sex. Fingering or manual sex is sex. Kissing can be sex. Be sure that you know your risks for all of those things and are being responsible about them while you're figuring all of this out.