Transcript for Amanda Bynes speaks out about her mental breakdown
Thank you. Now to our "Gma" cover story. That revealing new interview with Amanda Bynes opening up about the breakdown that forced her to step away from the public eye and what was behind it. Paula Faris has the story. Good morning, everyone. Bynes said everyone thought she was the good girl but at a very early age she started experimenting with marijuana which led to a dark road of drugs and depression but today Amanda Bynes is sober and she's saying she's sorry. Former child star Amanda Bynes. Thank you so much. Reporter: Breaking her silence overnight sharing her struggles with depression, drug use and sobriety. Bynes opening up to "Paper" magazine saying she began using marijuana at the age of 16 and that later on it progressed to doing Molly and ecstasy and would experiment with cocaine and adderall. Her use of adderall pills was around the time she was starring in the hit musical "Hairspray." ?????? the 32-year-old telling the magazine that, quote, I definitely abused adderall. Even sharing during the filming of a separate movie, she would be in her trailer chewing on the tablets because she thought they made her more high that way. She really attributes some of what happened and changing in her behavior to the drug usage as it escalated and became, you know, a much more serious issue. Hey. What's up? I'm Sebastian. Reporter: Bynes goes on to share her reaction to seeing herself in some of her biggest movies. After watching her performance in "She's the man" she says she went into a deep depression because I didn't like how I looked when I was a boy. And after her work in "Easy a," the actress says I saw it and I was convinced that I should never be on camera again and I officially retired on Twitter adding, I was high and I was like, you know what, I am so over this, so I just did it but it was really foolish and I see that now. I was young and stupid. It was during her self-imposed exile from Hollywood that Bynes says she felt adrift. I got into my drug usage and became a dark, sad world for me and was stuck at home getting high, watching TV and tweeting. She adds, everything I worked my whole life to achieve, I kind of ruined it all through Twitter. Bynes now says she's ashamed and embarrassed by the controversial things that she said on Twitter and that she's been sober for almost four years. This is sort of her wanting to tell her story, kind of close a chapter that was difficult, move on and start the next phase of her life and career. Reporter: For Bynes this next chapter is one she's optimistic about. I have no fear of the future, she says, because she's been through the worst and came out the other end and survived it. It's only up from here. She is now going to fashion school and wants to get back into acting the same way she did as a kid with excitement and hope for the best. She doesn't want to limit herself. What a platform she has. She can say I had it all and I allowed substance abuse ruin it all. She blamed herself. She said, I put it out there, not the fault of Twitter. Taking full responsibility for her actions and big sorry and there's power in vulnerable. This will help a lot of people. Robin. Thank you.
This transcript has been automatically generated and may not be 100% accurate.