VIDEOS: Britney Got Married 'For the Wrong Reasons'

11/19/2008 AT 01:10 PM EST

How does Britney Spears handle everything she's gone through in life? She dances.

"If I have a lot of nervous energy, when I start dancing it all goes away and I just feel emotion. It's like a roller coaster," Spears says in the upcoming MTV documentary Britney: For the Record. "People think that when you go through something in life you have to go to therapy. For me, art is therapy, because it's like you're expressing yourself in such a spiritual way."

Spears, 26, also talks about her 2004-06 marriage to Kevin Federline. "I think I married for the wrong reasons," she says. "Instead of following my heart and doing something that made me really happy, I just did it for the idea of everything."

The singer wants to set the record straight in the documentary, which airs Nov. 30. The film is the culmination of her being trailed by a camera crew for three months as she recovered from her meltdown earlier this year and recorded her next album, Circus, due out Dec. 2.

Spears, who called her life worse than a jail sentence, says dancing has helped her deal with her life.

"Sometimes you don't need to use words to go through what you need to go through. Sometimes it's an emotion you need to feel when you dance, that you need to touch. And the only thing that can touch it is when you move a certain way."

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