Lindsay Lohan doesn’t think she’s perfect. “The thing is, people do things and mess up,” she says in the new issue of Los Angeles Confidential magazine, hitting stands next Friday. “No one’s perfect. I’m human.” How true that is. About two weeks after the interview took place, the 20-year-old starlet checked herself into rehab after a nasty weekend featuring some very public displays of partying.Lohan admitted that Hollywood isn’t always so kind to her. “The real hard thing about L.A. is that it’s all about one thing,” she says. “Everyone always wants something. This industry is very lonely; I tend to get very lonely.” She may have used that sadness while shooting I Know Who Killed Me, her upcoming thriller in which she plays a stripper abducted by a serial killer. “I do a lot of crying in scenes,” Lohan says. “At one point, [my character] takes a bunch of pills. I didn’t know how to approach the challenge, so I just dove in.” And yes, she does do some stripping in the movie. “Leading up to it, I was a little shaky, but I had some friends on set and in the end I wasn’t nervous,” Lohan remembers. “Once I was in costume and really ‘in it,’ the scene went great. It doesn’t come across as cheesy or gross, like, Oh, she just wanted to take her clothes off.”