Why do people treat me good some days and others bad?

When I go out to shop or go for a walk some people are very nice to me and kind but other days they just treat me bad, very competitive or like they hate my presence there, I'm a 21 years old guy. Why? This happens with acquaintances and strangers. And I am not talking just two people in the day, I'm... show more When I go out to shop or go for a walk some people are very nice to me and kind but other days they just treat me bad, very competitive or like they hate my presence there, I'm a 21 years old guy. Why? This happens with acquaintances and strangers. And I am not talking just two people in the day, I'm talking about almost everyone
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