Making yourself a personal checklist list and if most answers are positive its a big sign you have ocd. examples of such checklists can be found online. try a few of them, most will give you an answer after you filled them in, also read articles online. Do you recognize yourself in these signs?
Also ask help help from family members or your loved ones and end up with a list of behaviors you recognize yourself in.
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How do I know I have OCD without therapist help?