What is this Kurt Vonnegut quote?

I've been searching online and skimming through Breakfast Of Champions trying to find this one quote but I can't and I'm absolutely desperate which is why I turn to this to help me. I believe Kilgore Trout says it I just can't remember when or where and it goes something like "I swear i think i'm a character in a book written by an author who writes about suffering all the time" I know that's not the quote but that's as good as i remember it. What is the quote?!