I don't like "Who is the baby's daddy?" Type of thing or romantic that much. Or teen stuff ( unless it's mean girls )
I like horror and mystery.
Also I doubt this will get very many answers since a lot of people don't read.
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I really enjoyed Between Shades of Gray and Sarah's Key. Those are more historical novels that deal with WWII, and I absolutely loved them.
Also, if you like fantasy, I highly recommend the Falling Kingdoms series. It's like a milder version of Game of Thrones (the author actually is a screenwriter for that TV series I think!). The Infernal Devices series is also good. It's a pre-series to the Mortal Instruments, but I know Cassandra Clare's style of writing isn't for everyone.
I also liked A Confederacy of Dunces (it's hilarious in a satirical way), Going after Cacciato (Vietnam War), To Kill a Mockingbird, and Catcher in the Rye. I bet you've read some of those since I read all of them for school, and enjoyed them the most out of all the required books. Seven Daughters and Seven Sons is also a very good book. It deals with sexism and equality.
Another book that centers on teens but is not particularly teen-y is Unwind. It's one of those dystopia books, but it's really different from anything else I've read. I suppose you could always go for the Game of Thrones novels, but since you're only 15, I don't think some of the parts will be appropriate. I liked the Kane Chronicles too, which are also by Rick Riordan (you're probably read them as well).
The Divergent series was also good, but I liked the first one best (and you've probably seen the movie or read the book). Me and Earl and the Dying Girl is an absolutely hilarious book. It's really unique, but once again, it deals with teens. It's NOTHING like the Fault in our Stars (I've heard people saying how they thought it was just a copy of it--it's not!).
The Book Thief is another historical novel that I'm only beginning, but it's very interesting. It also deals with WWII. I read a bit of All the Light We Cannot See (I was at Costco haha), and it seems very very good. Again, it's a historical novel centered around WWII. I'm just realizing a read a lot of WWII fiction novels haha.
OH! If you like horror, I highly recommend Anna Dressed in Blood. It's... humorous, it has romance, mystery, horror... I can't really describe it, but I couldn't put the book down. Another mystery novel is We Were Liars. It's haunting.
Alright I'll stfu right after this. I know you don't like the typical teen stuff, but I really enjoyed the Shatter Me series (and I also don't like the teen category).
Hope I helped! I'm absolutely in love with reading!1