Oh E., I'm so sorry to hear about your situation. I felt compelled to just respond to let you know that you can do it! You seem to be so strong, I hope you know that all will be okay (hard to realize being that it's so new).
Try Amazon.com they're so many books that I'm sure you can choose from. A friend of mine found a ton of books (for explaining STD's, sex, dealing with a new baby, death, and everything else) for kids. I haven't heard back from her on the actual title, but that's where she goes for her book searches, and google.com that is. At least if you do that, then you can either order it from there, or contact Barnes and Noble to see if they may carry the book.
I hope this helped you in some way, though it wasn't what you initially asked for. Stay strong, and encouraged and maybe you need someone to talk to as well. I'm sure that you can still talk to your parents. When you feel down, pray for strength, courage, and wisdom. All things that I'm sure you posess, but you will have to rely on now more often.
Take care,
A.