Top Nine Revelations in Diana Nyad's New Book 'Find a Way'

— -- Sharks, jellyfish, storms and 110.86 miles of open water couldn't stop Diana Nyad from making history. The superstar swimmer, then 64, conquered the route from Cuba to Key West on her fifth attempt, becoming the first to do so without a shark cage. Nyad opens up about her historical 2013 feat and much more in her new tell-all memoir, "Find a Way." The extreme athlete went one-on-one with ABC's Robin Roberts to talk about some of the book's biggest revelations.

1. Nyad's huge life lesson: Just because someone says something is impossible, that doesn't mean it's true.

"You can do all the computations you want as to why this is impossible and this can't be done," she told ABC News. "But don't ever tell me what the parameters of the human spirit are. We have no idea how powerful our hearts and our souls are. We only know how limited our muscles are."

"There is a feeling of character that builds when you say, 'I'm not a quitter,' no matter how cold, no matter how tough, no matter how much pain," Nyad, 66, added. "Even the box jellyfish, my spirit is bigger than that. And there's a character that stays with you a long time deep under. And to me it's worth testing one's self ... Most people have that chutzpah in them. And they want to live it out. They don't want to sit at home quietly and lock the door. They want to be out living it out."

2. Nyad reveals she faced many challenges early on, including molestation as a child -- but she didn't let that hold her back from reaching huge success.

"I have felt pain and anger, deep anger ... as together and as happy and as privileged as I am, it's still an imprint," she explained. "I have to admit that even all these years later, all these wonderful experiences later, there's an injured little girl in there still."

3. Being stung by a box jellyfish is beyond painful -- it can be deadly.

"I went into spinal cord stroke-symptoms.htm" id="ramplink_paralysis_" target="_blank">paralysis. I was screaming like my body was in hot burning oil. I was screaming, 'I'm on fire,'" Nyad said. "Honestly ... I shouldn't have lived. I shouldn't have lived much less swum through an entire night, the entire next day."

4. Nyad relied on a playlist of 85 songs to power through long swims -- and it was all in her head.

"Now mind you, I'm not listening to headphones. It's just in my brain. And you're out there. You're in an extreme state of sensory deprivation. When you're in the water, you've got a tight cap over your head, you don't hear a thing," she said. "Neil Young -- I would hear that haunting, falsetto voice. I'd sing it with my stroke. 'I hear you knockin' at my cellar door. I love you, baby, can I ask for more?' And that got me through. I would sing 1,000 'Needle and the Damage Done,' -- 1,000 which takes me nine hours and seven minutes exactly. Not a few seconds more, not a few seconds less. It is an exact count ... The songs were important."

5. Swimming may look like a solo sport, but it takes a team.

Before reaching the Key West shore during her triumphant 2013 swim, Nyad circled around her team, thanking the dozens who devoted their time and energy to helping her make it from Cuba to Florida.