How do I deal with the trauma of bullying since it happened so many years ago?

My therapist said they can tell it bothers me because I ball up my fists in anger when I talk about it I don't know how to deal with it though because it happened when I was a child I’m now almost 30 the only thing I can think of is punching his teeth out but I can’t do that its wrong and illegal

How do I deal with the trauma of bullying since it happened so many years ago?
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