Bristol Palin may only be 20 but she has plenty of regrets to air in her memoir that comes out next week, Britain's The Daily Telegraph said.

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Sarah Palin's single-mom daughter teamed up with writer Nancy French on "Not Afraid of Life: My Journey So Far," which chronicles her life growing up and her unfortunate relationship with paramour Levi Johnston.

The Daily Telegraph said Saturday that despite her mom's high public profile, Bristol devotes much of the book to Johnston, including the camping trip with him that led up to the loss of her virginity.

Johnston fares poorly in the book, The Telegraph said. Bristol described the father of her child as a cheating slacker whom she considers a "gnat."

"I'd just made a complete fool of myself and given my family the middle finger," she laments in recalling her final break with Johnston.

Johnston went on to modest notoriety with a cheesecake spread in "Playgirl" magazine, a project Bristol writes made her want to "puke."