When I was at school I read a lot of SF books, so much so that my teacher told my parents that she was worried I was not reading enough other materiel, that Science fiction was to narrow a genre. Of course they rebuked this, and they were right. SF is one of the most diverse fields there is. Just look at this list of sub-genres from the excellent bestsciencefiction.com:
And this is not even all of them. As you can see, there is a lot of different Sci-Fi out there. Why not give something new a go?