When we define ourselves as needing to be in control, we are sure to be very upset a fair amount of time since it is impossible to control the universe. Why do we do it? Because we perceive the universe to be hostile and chaotic. And if we can control everything we are less likely to be damaged by it. How can we change this? By changing our self-definitions. Obsessive-Compulsive Disorder is the same mechanism of "I need to be in control" taken to the extreme.