what books should i read?

ok so i'm 13 but i can read better than my 16 1/2 year old sister. i often read the same books as my friends, so we can talk about them, but i find them stupid, and "immature" i guess you could say. i mean i like the books but they seem to easy to read. what are some suggestions that are a bit more challenging.
some books i've read and liked were:
geek magnet
marked series
uglies
night world
the kidnapping of Kristine lattamore

some books that look interesting are [i haven't read yet]
skinny by ibi ________ [forgot last name]
the princess plot
13 reasons why

i really like stories about people with "problems". like drug abuse, eating disorder, self harm...but i can never find books like that. i also like realistic fiction,

thanks ahead of time!

ps even though i liked the books i mention i still find their topics still a little "immature"

i've already read twilight it was ok, and please no harry potter!
sorry it's just really important! i really need to know as many books as possible!
 
Crank, Burned, Impulse, A Million Little Pieces(got a lot of language though), and there's a book called the meth diaries or something
 
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