With seven "Harry Potter" books, eight movies, a new spinoff trilogy called "Fantastic Beasts and Where to Find Them" and an upcoming stage production called "Harry Potter and the Cursed Child," J.K. Rowling is one of the most successful authors that ever lived. While the author has reached legend status, she recently revealed that she was not always as confident about her writing, or her story about a boy wizard named Harry.

Rowling admitted in a conversation with Lauren Laverne for The Guardian that she was terrified that the second "Harry Potter" novel, "Chamber of Secrets," would not live up to the first book, "Harry Potter and the Sorcerer's Stone." She told Leverne in the interview that after she got an American deal for the "Harry Potter" books, one of her best girlfriends called her and asked her why she was not happy.

"From the outside, I'm sure everything looked amazing. But in my flat, where I was still a single mum and I didn't know who to call to do my hair, everything felt phenomenally overwhelming," she explained. "For the first time in my life I could buy a house, which meant security for my daughter and me, but I now felt: 'The next book can't possibly live up to this.' So I managed to turn this amazing triumph into tragedy, in the space of about five days."

The second book in the "Harry Potter" series was released and was even more successful than the first book. Rowling went on to win a number of awards for "Chamber of Secrets," including the Nestlé Smarties Book Prize and Scottish Arts Council Children's Book Award, according to Entertainment Weekly.