Ender's Game is an awesome book. I first read it in 9th grade and could not put it down. You will enjoy it a lot. The series that follows is also great and enlightening on topics such as overcoming hate, perseverance, humanity, character, inspiration, etc
I just finished reading book 3, which catches up to the tv show. Book 4 I am starting tonight. I read 1 book every 3 weeks - game of thrones books are much longer so 5 weeks apiece.
P.S. Catcher in the Rye is great book, I read it years ago in middle school. Bit depressing book though