Stuck in a Vanishing Fairy Tale

I found this book and now I don't know what to do with it. When I found it a mirror and a key came out with it. I found this book in a cave behind a waterfall, when my mom and I were vacationing in the Caribbean for a few days. I showed it to my friends and they all believed my story. Now my friends and I are stuck in separate stories and we don't know how to get out.