Couldn't get rid of the mannerism

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So i have this mannerism since i was in my high school years liike i couldn't help but to pick my nose at all times and would sometimes rub it because it feels kinda itchy sometimes. I don't know if many of you have experience this but this thing really annoys me and by that i have to restrain myself not to do it for the sake of looking normal. It kinda feels shameful most especially when i am talking to a person i just met or when i am on a meeting / conference and being surrounded by many. I don't know if anyone of you relates to the same concern that i have but if so, were you able to finally stop doing it? like how? And if those mannerism i mentioned above was not the same as yours, then can we at least share what are our differences in terms to mannerisms and how did you guys deal with it or finally put an end to it?