Sauvie
First, 16 and still being a virgin is something that I would really not be panicking about.... nor would I want to lose it at 16. Secondly If you are getting sick before hand, I can't say anything better than you're just not ready at the moment, and that too is not a problem. I know that Sex is all high and mighty in the world, but waiting for the right person is something that I think feels more rewarding than just desperately shuffling to lose your virginity. sorry if this post was mean at all, it just astounded me to be quite blunt.
Pretty much this, and what Lorien said. It's normal to be nervous when having sex for the first time, but if you're throwing up beforehand, then that's a pretty big sign that you're not ready. There should be no rush to have sex anyways.
In the meantime, enjoy dating and being a teenager and enjoying life while you can. Once you're an adult, you get all sorts of responsibilities that you have to deal with, especially once you're out on your own.
Once you have sex, you open yourself to a whole world of possibilities that have their own risks and consequences, like accidental pregnancy, STD's and so on. Any one of them can change your life permanently, for better or for worse. Lorien specified several things you need to know about first before having sex anyways - birth control, back-up plan in case of unplanned pregnancy, accessing and splitting the cost of birth control, your partner seeing an ob-gyn, getting tested for STD's, protecting yourself and your partner from STD's, and so on. Lots of things for a 16 year old to worry about, so don't rush it.