NEW YORK — Hindsight is 20-20 for Lindsay Lohan. "When I look back on this last year, it's like, what was I thinking?" the 21-year-old actress says in the March issue of Harper's Bazaar magazine, on newsstands Feb. 19.

Lohan was arrested twice last year on DUI charges and pleaded guilty in August to misdemeanor drunken driving and cocaine charges. She served 84 minutes in jail as part of a plea deal, and checked into a rehab center in Utah.

"I've learned so much, though, like learning to live my life a different way ... and I wasn't taking the time to feel my feelings," she says. "Being away and going to a place where I could learn about that and take the time with a clear mind to get back on the right track was nice."

The "Mean Girls" star -- who was shown on a video taking a swig from a champagne bottle while ringing in the New Year in Capri, Italy -- says it's hard to resist the urge to party.

"I have it in me to go, go, go," Lohan says. "I'm still young. I love life. I love music and being around that. I love people, and I'm a very social person. But I also love being home, quiet and normal."