"The girls took it beyond normal bullying. These were big, tough girls," Cyrus says in the book, which hit stores on Tuesday. "I was scrawny and short. They were fully capable of doing me bodily harm."
During one of those instances, the mean girls locked Miley in the bathroom during class. "They shoved me in. I was trapped. I banged on the door until my fists hurt. Nobody came," she writes. "I spent what felt like an hour in there, waiting for someone to rescue me, wondering how my life had gotten so messed up."
Miley also describes how the girls escalated their bullying on the future star by confronting her and challenging her to a fight. "It seemed like Operation Make Miley Miserable was escalating to a new level. More like Operation Take Miley Down," she recalls. "Three girls strutted up and stood towering over me. My stomach churned. I clutched my grilled-cheese sandwich like it was the hand of my best friend. It pretty much was my best friend those days. I was done for.
"They started cussing me and telling me to get up. I sat there, frozen. I didn't know what to do," she continues about the incident, which ended when the principal stepped in. "Finally, I couldn't take it anymore. I wasn't chicken. What could they do to me? I was surrounded by people. I stood up, still a foot shorter then they were, and said, 'What's your problem? What did I ever do to you?' "
Her classmates also teased her about her family, telling her, "Your dad's a one-hit wonder. You'll never amount to anything — just like him."
But it's not only the hard times in Tennessee that Miley shares in the book. She also talks about working hard to beat out her competitors, like "Gossip Girl" star Taylor Momsen, for the role of "Hannah Montana." "I didn't dare forget the struggle. There was a reason for it. I brought that girl with me, and she reminds me to be compassionate," she writes. "To not hold grudges. To be supportive. To be there for others when I know I'm needed."
Cyrus, who describes ex-boyfriend Nick Jonas as "Prince Charming" in the book, still seems surprised that their relationship didn't last. "It felt like the whole world stopped. Nothing else mattered," she says about meeting him, adding that when they broke up it was "the hardest day ever."
"Deep down, I know we weren't being our best selves," she says of their time together. "And that was what I wanted — and thought I deserved — in a relationship."
While dealing with the pain of the breakup, Cyrus says she wrote the song "7 Things" so that she could "punish him, to get him back for hurting me," but the song ended up being "about forgiving, not forgetting."
It's hard to imagine that our love is a story with an end," Miley writes. "But you know, at least I'm getting some really good songs out of it."