'I'm An Addict,' But Lindsay Lohan Says She's On The Straight & Narrow This Time

Lindsay Lohan says she's "clear-headed and focused."

The actress, appearing on Oprah's Next Chapter, told Winfrey that her most recent rehab stay, at Cliffside Malibu, instilled in her a new confidence and resolve to stay on the straight-and-narrow.

"I feel whole again and I have such a desire to want to keep this feeling and stay this way, and I'm willing to do whatever it takes," the Mean Girls star, 27, said Sunday.

In speaking about her past demons, The Canyons starlet said that booze, "in the past, was a gateway to other things for me," and said she'd done cocaine, but no more than 15 times.

"You're not on any prescription drugs?" Winfrey asked LiLo, who responded, "No, no -- I take Nexium. Because I have acid reflux."

Asked about her parents Michael and Dina, Lindsay played it coy, saying that "nobody's perfect.

"I love my parents," she said. "Certain situations I would have preferred to have been handled differently. Certain things I would have preferred to have been kept within my family in private.

"I hate what a bad rap people give my parents, because they're just parents, really, at the end of the day and trying to stand up for their daughter themselves. I've asked in sitting with my parents recently, 'Keep our life private, please.'"

Lohan, who wore an orange dress in the appearance, told Winfrey that she's "lived so many lives in one lifetime," and believes the changes will stick this time.

"I haven't felt the way I've been feeling recently and feel now in a very long time -- I feel whole again," she said. "I have such a desire to want to keep this feeling and stay this way and I'm willing to do whatever it takes … I really want to be on set. That feeds me."