Singer-actress Lindsay Lohan claims she doesn't know anyone who works as hard as she does."I work harder than most of my friends' parents. I'm the hardest-working person I know. I'm a workaholic. I don't know what to do when I'm not working. I get creatively frustrated," contactmusic.com quoted Lohan as saying.The actress, who is more famous for her turbulent personal life rather than her career, says she always needs something to keep her busy.