What subjects should I learn in order to be an astrophysicist?

I am a sopre in high school, and I am really attracted to the field of astrophysics. Right now I am trying to teach myself a lot of math, especially calculus. I currently have the book Road to Reality by Roger Penrose- which is a fine book- but I would like to get books that are specialized in a specific field. For example, I search through Amazon.com and look for books in quantum physics and relativity (considering those are the two MAIN fields of study in that profession). I understand that a lot graduate level education is needed, but I think I can take it. I was wondering if you could give me a list of REALLY good SELF-TEACHING books, including the author(s), in the fields of study of an astrophsyicist.