Do you feel able to tell us a bit more clearly what exactly has happened? You say a lot about how you feel about your relationship with your parents, but it's hard to put that in perspective without knowing exactly what has been going on. What exactly do you mean by "covert incest"? Does this involve both your parents, or just one of them? You say that you've been saving yourself - what sort of relationships, if any, have you had with men in your life?
I'd agree with babypooh that you have issues that would really benefit from seeing a professional. I hope that you can find some help and support through this board, but you may need more help than we can give.
I am truly sorry for what you're going through. I think that it's important that you realized the emotional problems you're facing and should see some kind of therapist. Writing also helps to get all your feelings out. Talk with friends, keep coming on this website and/or write in a journal. You definitely need to see a therapist though. They will help you better understand your emotions and maybe shed some light on the whole situation. Don't beat yourself up over anything though; don't worry about things you cannot change. We often waste too much time doing that. Love yourself no matter what and do what you need to do to feel better. Love yourself. Trust God and give him your problems. Trust yourself and let things go. Everything will fall into place one day, with the help of God. Good luck.