Is it normal to fantasize about beating up someone?

Is one girl ( my relative) who I really hate, she is sometimes rude , looks down on me and she obviously thinks she's better than me - because is rich , more pretty , has better grades, more friends...

Sometimes when we meet I fantasize about beating her up, cutting her hair, forcing to eat awful things and like this...

it really makes me feel better . But then I wonder if it's normal? if other people do it too, or I am just bad and should stop it?
Is it normal to fantasize about beating up someone?
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