Should I report this book to my library?

Hi, I'm a middle schooler. 7th, actually. I checked out The Midnight Club by Christopher Pike and it's a really good book. But, I think it's, not fit to be in a middle school library. I mean, it sort of was descriptive in Mature parts, if you know what I mean. And my friend is telling me not to report it to my Librarian but my conscience tells me other wise. If you've read the book, most of it is in Anya's first story. My chin dropped when I read that. Haha, maybe I'm just being immature. I don't know. What do you think I should do?