"I think it was just situations that I was putting myself in," she told PEOPLE at a photo exhibit last week at N.Y.C.'s The Atelier. "I was putting myself in the wrong situations and I didn't have the focus in the right place."
Since leaving, Lohan, 21, said she's rid herself of bad influences and hangers-on. "I did – I changed things," she insisted.
The starlet also said she keeps in touch with the friends she met at Cirque Lodge and that her family has helped keep her on track.
"My family has always been important to me, and they've always supported me," said Lohan, who reunited with her estranged dad, Michael, while in rehab. "I'm blessed to have a really wonderful family."
Career RevivalAfter a tumultuous 2007, Lohan's career seems to be back on track. She's recording a new album and begins filming the Jack Black movie Ye Olde Times this spring. ("I'm excited to go and do a comedy," she says.) And Chapter 27, which costars Jared Leto, is set to open later this month.
So does Lohan view this as her comeback? "I think this is what I love to do," she said. "I'm just continuing to do it – in the right ways."