Haha who hasn't read Twilight already?
But I think you should read these books that have inspired and delighted me with meaning and also entertainment. I don't just want to copy down a bunch of teen books from a website. I'd rather give you my opinion too.
Blue Bloods series (if your looking for romance, break ups and a bit of friendship, I think this book is right for you!! Though it has vampires but it's different from twilight.)
The Private Series (This book is about scandalous lives, romance, break ups, secrets and much more!! You'll be dying for the next book!)
Kira Kira (Sometimes I take a break from romance and read books like this which is sad yet meaningful.)
Thousand Splendind Suns (THE BEST BOOK EVER!!! I think it's sad yet meaningful and makes you feel grateful of all our rights us women have these days)
The Kite Runner (It is also by the same author of Thousand Splendid Suns by Khaled Hosseini, and this book will make you look at the world a different way)
So B. It (You probably read this but even though it's sad, you'll cherish each moment and page until the book ends)
Lucky T (Now this book has some love, comedy, nonsense, and of course love. I've read this book almost 3 years ago and I still love it)
The Luxe series (This book is about love and scandals where you'll be reading like crazy. This also happens in New York in 1899 so you might be getting a bit of some history too)
Well I hoped that Helps =)
Good Luck ^^