"It's a frightening experience. There's a line that needs to be drawn now," the actress-singer told reporters recently, according to AP Radio.
Lohan suffered cuts and bruises in the accident last week in Los Angeles. Police said the photographer intentionally rammed the left rear of Lohan's 2005 Mercedes-Benz.
"I was so shaken up, but I was still nice 'cause I was like, `I understand it's your job. But you don't have to ram into me next time. I'll give you a picture.'''
It's been a difficult year, Lohan said.
She broke up with "That '70s Show" actor Wilmer Valderrama, was hospitalized for exhaustion and has lost weight. Her father has had various run-ins with the law.
"I'm an 18-year-old girl and I've dealt with so many things in this past year," she said.
Lohan said she can't figure out why tabloid magazines are so interested in her personal life.
"There's not much I can do at this point anymore. I feel like the more I kind of defend myself, then the more they say. I'm just such an easy target, I guess. I don't know why I'm so interesting."
"Hopefully, people will get sick of it and ban buying the magazines in protest against it for a month," she said. Lohan added, with a laugh: "But I can't say that I don't read it."
Her role in last year's "Mean Girls" earned her the award for best female performance at the 2005 MTV Movie Awards, taped Saturday night in Los Angeles.
Lohan's new film, "Herbie: Fully Loaded," will be in theaters June 22.