Favorite Book/Book Series: The Inheritance Cycle by Christopher Paolini. More specifically Brisingr is my favorite book but as that is the third book in a series of four, I will give you information on the first book Eragon. This link is for the series official website and this is the link for the first Book in the series: Eragon. Eragon is a fantasy fiction novel, that focuses in on the story of a young 15-year old farm boy who accidentally discovers a dragon egg in the forest by his farm. In the land of Alagaesia, all is not right though! A mighty Group known as the dragon riders used to help govern the 3 major races (humans, Elves, and Dwarves) and serve as protectors of the land 100 years ago. However when one in their ranks turns dark after the death of his first dragon, He and 12 other riders band together and destroyed every dragon, rider and egg while Galbatorix (the one who turned against his brothers) took over as King of the land. With such an oppressive and unmerciful King, the land soon fell into darkness. Fast forward to present time, the egg finding Eragon was no mistake, but who could have sent it? Guess you will have to read to find out! Really though, this was overall my favorite book series ever. Each book is rather lengthy so be prepared for that, but if you have any interest in fantasy, dragons, swords, etc and haven't read this book yet, I highly suggest it.
PLEASE READ THIS AS IT IS SUPER IMPORTANT Under no circumstances should anyone ever watch the Eragon Movie. It was one of the worst novel to film adaptations of all time
If you're looking for an age appropriate fantasy series definitely check out the Inheritance Cycle.
http://www.amazon.com/Eragon-Inheritance-Book-Christopher-Paolini/dp/0375826696
I started them around your age and read them so many times I broke the spines. They're some of my favorite books.