Why is my first reflex to hit someone whenever I get angry?

I apologize for my poor English. This really bothers me. I get angry and my first reflex is to attack someone or break something. I can barely control myself. My whole body gets really hot and my brain just shuts down and my only thoughts are how can I hurt the other person. I’m really scared, because I may not be able to control this urge someday. I sound insane, but I would really appreciate some opinions on this matter. I’m really trying to improve and help myself. What is the reason? Why can’t I control?
Why is my first reflex to hit someone whenever I get angry?
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