How do you forget something?

In reading a book, it is my custom to read from the very first page to the last, and, yet, a famed professor of English of some high university (Oxbridge or Camford of something), starts off with a rather long introduction unkindly placed in the beginning of the book, giving commentary and snippet of the plot's details along with interpretations on interpretations. No doubt, I can't read the text without the expectation of what is to come, and with the good Professor's interpretations, and, this in turn, have diminish, with no small amount, my enjoyment of the book. How, then, can I rid myself of such thoughts and banish it from the realms of my head or else repress it so that it shall prop up no more?