Do I have a reading disability?

I am sixteen years old at the moment, and I have noticed that I am terribly slow at reading. I recently read 'Crime and Punishment' by Fyodor Dostoevsky and it took me about an hour to read about twenty-five pages of it (needless to say, it took me ages to finish the book). I am now reading 'The Picture of Dorian Gray' (Oscar Wilde, of course) and it takes me about the same time to read twenty-four or so pages. I also find myself re-reading lines over again by accident.

I have also noticed that when I write, I often swap words around by accident (for example, i may write "today was day a quiet" instead of "today was a quiet day"), but I notice the mistake immediately.

I don't know if that would have anything to do with the slow reading, but I think that I read much much slower than most people. I don't know if it's simply because I'm an horribly slow reader or if I may have some sort of disability or something. I know that this is the Internet so it's probably difficult to determine, but if anyone has suggestions as to what could be wrong or the answer, or any advice on how I could help myself read more quickly, that would be grand, thank you. x x