In her early 20s, Juliette Lewis was a successful TV actress, coveted film star and Oscar nominee. But behind closed doors, she was struggling with both an addiction to drugs and a mental health condition.

Now, the 41-year-old is getting candid about her past demons in a revealing new interview with 'People.'

"I can tell you I have dealt with mania my whole life," she said. "I am manic and crazy!"

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Juliette at age 17 in 1990.

At age 14, Juliette was thrust into stardom when she landed a role on 'The Wonder Years' and a part in the cult classic 'National Lampoon's Christmas Vacation.' Just a few years later, the young star entered a rehab facility for a drug addiction.

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"I quit drugs at 22," she said. "I traveled a lot, I dealt with my priorities. I have such a beautiful, strong family and friends and they are like everything to me."

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Juliette with her costar Ryan Phillippe on 'Secrets and Lies.'

Since the 1990s, the actress — who received an Oscar nomination for her performance in 'Cape Fear' — launched a career as a solo singer and musician and is now making what many are calling a "career reboot" in the new TV drama 'Secrets and Lies.'

"This is my first time playing a homicide detective [and] I respect this line of work. I'm very severe in my role — I wear a bun, I'm sort of asexual. Originally the role was written for a man; I don't have a lot of niceties in my character, she's just all about the job. So for me, that was a fun person to play," she said.

Juliette spoke to 'People' magazine.