Naya Rivera Opens Up About Battling Anorexia, Getting an Abortion in 'Sorry Not Sorry' Memoir

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Naya Rivera isn't holding anything back.

In her upcoming memoir, Sorry Not Sorry, the Glee actress gets candid on everything from her past relationships, to battling anorexia as a teen and undergoing an abortion.

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"I've done a lot of living," the California native tells People. "I'm a 79-year-old trapped in a 29-year-old's body."

The tell-all officially hits book shelves on Sept. 13, but an excerpt published in the latest issue of People gives fans a glimpse of Rivera's lighthearted, truthful writing.

On suffering from anorexia, Rivera reveals she "started feeling that what had begun as a game had maybe gone too far" by the time she was a sophomore in high school.

"I just avoided food at all costs," she writes. "If my mom had packed a lunch for me, I'd either trash it or find some excuse to give it away."

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"I was so young and it just seemed to be the norm. Everyone was going through similar stuff," she continues. "I had no way of knowing if I was going through it worse. I was juggling my feelings and it makes me sad that there are girls still going through that 15 years after I went through it."

Back in late 2010, Rivera called it quits with her now-husband, Ryan Dorsey, in order to focus on her career. Just a few weeks after the breakup, she found out she was pregnant with the actor's child. She decided to keep the news to herself and scheduled an abortion during a day off from filming Glee.

"It was very scary to open up about everything," Rivera explains. "It's not something a lot of people talk about, but I think they should. I know some people might read it and say, 'What the hell?' But I hope someone out there gets something out of it."

The brunette beauty eventually got back together with Dorsey, and the two said "I do" in Cabo San Lucas, Mexico, in July 2014, just months after Rivera called off her engagement to rapper Big Sean. The pair is now parents to son Josey, who will celebrate his 1-year birthday on Sept. 17.

"I hope Josey will read it one day," Rivera adds. "I hope it gives him a better perspective on the issues women face."

WATCH: Naya Rivera Reveals She Gained 60 Pounds During Pregnancy