The now 16-year-old is unveiling her darkest moments through a memoir, in a bid to help other teenagers, unexpectedly confronted by mental illness, to speak out and seek help.

"We're all just teenagers who are just so misunderstood by one another, and there's this stigma that mental illness is a weakness, you get judged for expressing your emotions, and it's just not right," Charlize said.

The book explores Charlize's lows, her tumultuous relationship with teachers and how she managed to turn a bad situation into something brighter.

"The name of the book is The Thread of a Demon. The demon is what I've called depression, and the thread is what was holding my life together," Charlize said.

When that thread begun to unravel, the world around Charlize began to 'decay' in her mind.

"It was in those moments where I'd run out of class and breakdown in the bathroom, because I couldn't handle it, that I realised, yeah, I'm not doing so well," she said.

"Or when I released that I had genuinely hurt someone's feelings, I could see it in their eyes, and then I would feel this immense guilt.

"I thought it wasn't ok that I wasn't ok, and I began to use teachers as an outlet. I would declined all help and discipline. I didn't want anything from anyone and I isolated myself from the world.

"Then I would come home from school and take it out on my mother. But I didn't think it was ok to speak out, I thought I was weak."

Charlize's Mother, Nadine Mulholland said as a parent, it is terrifying to watch your child struggle with mental illness.

"I can't even explain it, there are no words to make someone understand. Unless you've gone through it yourself, you just can't," she said.

"But we're one of the lucky ones. There's so many teenagers who have committed suicide, it's really scary, and our society needs to be more aware of it."

Charlize said one in four teenagers are met with mental illness, and she fears there are others out there who feel as though they need to suppress their pain.

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"I don't want other teenagers to do what I did, I want them to know that it's ok not to be ok and to ask for help. Talk to your parents, they will support you more than anyone will, just like my mother did," she said.

"They will help you more than you could ever imagine."

Charlize began writing the book during lockdown when she noticed herself relapsing.

"I wasn't doing well, but I thought I could be using the time to do something good for other teenagers, so I picked myself up and I starting writing dot points. I got a whole corkboard and started sticking notes on it," she said.

Charlize said her mother has been her number one supporter, along with her nan and her year coordinator.

"The teachers I was yelling and swearing at are now people I look up to, who have helped me significantly," she said.

"It goes to show, you can flip a situation around and turn something dark into something light."

The Thread of a Demon is set to be released at the end of the year.