How can I defend myself and speak up when people harass or assault me?

When I was a minor, some kids, teenagers, and adults would punch me, slap me, hit me. and bite me for no reason. Some people would also give me leers, and scary faces, and I’d look at their faces. When I was getting assaulted as a minor, I didn’t say anything, and I didn’t call the police. When people victimized me, normally I don’t called the police.

Also, I have difficulty telling certain people to shut up when they say certain things.

How can I defend myself and speak up when people harass or assault me?
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