As promised, here are some hints.
First of all, if you are completely clueless, then check out Teen Read’s Ultimate Teen Reading List. You never know what you may find.
#1 has been adapted to a movie. The book cover features the main actor.
#5 is the memoir of a famous journalist.
#7 is a picture book.
#8 won the Newberry Medal.
#10 is actually the cover of multiple novels, so I will accept multiple answers.
#12 is kind of easy.
#13 has also been adapted into a movie.
#17 shares the same author as one of my first book reviews.
#20 is somehow related to #10.
I hope that helps!