The 20-year-old actress told Allure Magazine during an interview that appears in its May issue that she decided to enter the secluded Wonderland Center, an addiction treatment facility, at the suggestion of her therapist.
"It's so weird that I went to rehab. I always said I would die before I went to rehab," Lohan said.
Her room was "all white, with a parquet, and it was different! I just felt safe," Lohan said. "I thought, I'm going to stay here tonight. And I stayed there. For a month. It was great."
Lohan said in January that she had checked into the center. Her publicist Leslie Sloane Zelnick confirmed in December that Lohan was attending Alcoholics Anonymous meetings.
Still, the star of "Mean Girls" and "Freaky Friday" told Allure, "I don't know that I'm necessarily an addict."
Photos: Lindsay Lohan
As for her fractured family past, Lohan laments that she had to intervene in fights between her mother, Dina, and father, Michael, who are now divorced, while growing up.
Her estranged father was released from a New York state prison last month after serving almost two years for driving while intoxicated and other charges.
"I feel like a second parent in the sense that I helped raise my family," she said of her younger brother, Michael, 19, sister, Ali, 13, and brother, Dakota, 10. "When my friends and family are around me, I feel like they're safe. No matter what happens, we're going to be fine."