I wanna start reading something, but I'm not sure what. Pendragon is what my mind is craving, but I can't find the books anywhere at my library. Do you have any suggestions as to what I should read? :3

Are you looking for other books in the same age range? The same type of book? Have you ever read anything by Garth Nix? He has a series called Keys to the Kingdom, its a middle-grade chapter book series that advances the reading level as the series goes on, sort of like Harry Potter did, allowing the reader to grow up with the books.
If you have not read the Artemis Fowl books, I also recommend those.
Other random suggestions:
Anything by Anthony Horowitz, The Alex Rider series, Gone (a post-apocalyptic series where children are the only ones that survived), and Matched by Aly Condie.

Keys to the Kingdom sounds interesting. What's that about?

If you're going with Garth Nix, look up the Old Kingdom series (or Abhorsen series if you're North American). I personally prefered that to the Keys to the Kingdom series, although I can't say much because I never read far into that one. >>; Maybe try both? xD