Where does the doubt come from?

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Hello,

what is the reason why persons with ocd (i have ocd myself) doubt so much? Why do people doubt liking things that they would never actually like? And also do not want to like?
What is the reason that you don't just know for sure what you like, like other persons, and can put stupid thoughts aside?

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You fear the topic of the thought and you feed it by paying attention to the thought. Try your best to not ruminate.