I love the Spice and Wolf light novels, they are a good read if you haven't yet.

Perks of being a wallflower, i also saw the movie, it was pretty good, i definitely recommend reading the book or watching the movie....or both? maybe?

The BFG, of course. Look at his ears! I mean come on, you know it's good!

No Twilight? I'm surprised.

I like Kite Runner, The Color Purple, Always Running, and Where the Red Fern Grows.

House of Night (series)... i think there's like 8 or 9 so far...
Fallen (series)

anything really by sarah dessen..

oh and anything that John Green has ever written is amazing

Fantasy/sci-fi:

Terry Pratchett (Discworld novels)*
Neil Gaiman (Coraline and graveyard book)
Trudi Canavan (The Black Magician Trilogy)*
Ernest Cline (Ready Player One)*
Robert C. O'Brien (Z for Zachariah)

General Fiction

John Green (Paper Towns, Looking for Alaska, The Fault in Our Stars)
Stephen Chbosky (The Perks of Being a Wallflower)
Louis Sacher (Holes)
Annabel Pitcher (My Sister Lives on the Mantelpiece)
Charles Bukowski (Ham on Rye)*
J.D Salinger (Catcher in the Rye)*
Jay Asher (Thirteen Reasons why)

Graphic Novels:

-Vera Brosgol (Anya's Ghost)
-Faith Erin Hicks (Friends with Boys)
-Bryan Lee O'Malley (Lost at Sea and Scott Pilgrim)
-Laura Lee Gulledge (Page by Paige)
-Daniel Clowes (Ghost World)
-Marjane Satrapi (Persepolis)
-Jen Wang (Koko be Good)
-Jillian Tamaki (Skim)

For all of the above graphic novels actually read them in my 20s (27 right now) but would have loved them as a teenage as well.

*Anything with the star, would probably be in the adult section.

Other:

-Any of the postsecret books especially My Secret.
-Wreck this Journal

I'm sure there are much more but that's all I can think of right now.

Hmmm let's see:
Divergent
Insurgent
Pendragon series
Icemark Chronicles
Maximum Ride series
Ranger's Apprentice series
The Lorien Legacies
Hunger Games series
The Midnighters series
Percy Jackson and the Olympians
The Heroes of Olympus
Artemis Fowl
Warriors (The Warriorcats series)

I heard Twilight is pretty bad ass.

Yeah me too. Totally go for that one.

especially if you like your vampires glittering in the sun

No bullshit here but I actually thought twilight was okay. But once that moment happened where he glittered like a disco ball it was over for me giving this series the slightest of a chance haha.

These

I am going to go a little older and say read the Dragonriders of Pern series by Anne McCaffrey...my mom turned me on to this series. The author passed away a couple years ago but her son has taken up writing this as well. If you like sci-fi and dragons, you will love this!
This author also wrote the Crystal Singer trilogy which is a bit more racy, but an amazing read.

Someone else mentioned Terry Goodkind's Sword of Truth series - I would highly recommend this as well.

Robert Jordan's Wheel of Time series - I still haven't ventured out to read the last book. This is a LONG series of LARGE books, but you won't regret it, I promise!

And my favorite author, Diana Gabaldon - Outlander series.

Someone else mentioned George RR Martin's Song of Ice and Fire series (Game of Thrones if you watch HBO). This series is amazing, but be prepared for every character you love to die. And sex. Lots of it and derogatory terminology for it...

And if you want some old school vampires and witches - I would recommend all the books by Anne Rice. Start with an Interview with a Vampire.

Escape from furnace