Being 17 myself and just recently having sex with my boyfriend for the first time (he's a year older), I can understand the paranoia. But honestly, you sound a little [i]too[/i] freaked out. I'm thinking maybe you guys shouldn't have sex if you're so afraid. After all, no matter how you justify it, no matter how much protection you use, sex is for reproduction. Keep that in mind.
I'm not trying to scare you off or anything. :) By all means, if you think you are ready and mature enough to be having sex (and you're the only accurate judge of that) go ahead. But I strongly urge you to read up about your bodies and how they work, reproductive-wise. I think that will ease your mind and help you understand better. Like recommended above, find out about the different methods of birth control as well. If you can, see if you can get the birth control pill. It's more effective than just using condoms, and if you use condoms in addition to the pill, that puts the odds of pregnancy at about 3/1000. (I think.)
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I'm not trying to scare you off or anything. :) By all means, if you think you are ready and mature enough to be having sex (and you're the only accurate judge of that) go ahead. But I strongly urge you to read up about your bodies and how they work, reproductive-wise. I think that will ease your mind and help you understand better. Like recommended above, find out about the different methods of birth control as well. If you can, see if you can get the birth control pill. It's more effective than just using condoms, and if you use condoms in addition to the pill, that puts the odds of pregnancy at about 3/1000. (I think.)
Hope I helped, and hope all goes well for you. :D