How to stop being an open book when talking to friends?

My nye resolution is to stop sharing personal details about my love life and among other things with my friends. I really need to learn how to have a private life. When I am trying to solve a problem in my love life or whatever I have this weird need to constantly try to ask friends and that leads to me telling them more things then they should know. Any ideas, tricks to help me? I really need to solve my problem of being an open book.
How to stop being an open book when talking to friends?
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