any circumstances, talk to a therapist, counselor, psychologist, or any other mental health expert about what you are feeling. This has the opposite effect of the bottle it up method.
Next, you need to ignore any signs or symptoms of any type of mental illness. If you are reading an article that is talking about depression and it starts listing symptoms, immediately leave the article and go find a book or a television show to distract yourself until you have completely forgotten about the aforementioned article. Your friend is talking about their anxiety problems and their depression and you think to yourself “I feel that way all the time”, change the subject as soon as possible to something more cheerful like puppies or kittens. If you have to research a mental illness for work or school, choose the one that you believe that you are least likely to have. Once you have done that, pretend that you have not realised that you might have that mental illness.
After that, you should then continuously make jokes about the mental illnesses that you pretend that you don’t actually have. For example, if someone tells you that you are a terrible person, look them directly in the eye with a blank face and say in emotionless voice “I know. I cry about it every night” then slowly turn around and walk away. If you do not hear the person laughing, don’t worry. They are still processing your joke. Sooner or later they will be on the floor, laughing hysterically with tears falling down their face. Trust me, I have learned this from my own experiences.