The Gift of a Story

As church started, his family joined everyone else in the church in standing up as everyone began to sing. The words were displayed on a projection screen above where the preacher would stand. After a few songs, everyone sat down and Scott thudded resignedly onto his chair, which he immediately regretted when he smacked into his book against the chair.
As another quieter song began, Scott reached behind him and pulled out his book. He also grabbed his pencil from his pocket and opened the front cover just as the congregation started to sing, “O, Come Let Us Adore Him, O, Come Let Us…”
This time when he turned to the first page with his pencil ready, instead of just seeing one word, there were several. He jerked himself in surprise and dropped his pencil on the chair beside him. He quickly picked it up before it fell to the floor.
He read:
Introduction
This is your story and yours alone. No one else can see it or live it. It’s time for you to see all that you can do. The Story Book has all kinds of stories and all kinds of adventures with no two alike. The story will lead you on as you are ready. Do not try to skip ahead, as you cannot. May you have fun…Scott.

He stopped suddenly and reread the last time. Was this some kind of joke? Had someone written something just to him. He turned the page and found only the words, Chapter One. He was almost certain that when he had looked through the book at home, those words had not been there. That wasn't possible, so he decided that he must have just missed them. He flipped through every other page and still saw nothing on the pages. He returned to the introduction and read it over again. He was completely baffled. What was this book?