How do I get over this bullying? And victim complex?

How do I get over this bullying? And victim complex?
Sorry, didn’t want to have to write this out again. I now have this victim complex as I felt completely powerless to improve my situation at the time. I didn’t trust the teachers and felt very isolated. How do I feel like I have agency again? Also, one guy threatened me with a knife and didn’t get expelled.
How do I get over this bullying? And victim complex?
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