I"ve been thinking about this question for a while now but is Receiver of Many a young adult book? I'm 15 years old and I want to know if I am able to read the book or not...

It is DEFINITELY not a young adult book.

Receiver of Many and Destroyer of Light, as well as other books I write, are filled with very graphic sex, violence, language and other things that wouldn’t be found in a YA novel. My advice is to wait until you’re 18 to read it.