I'm so sorry you had those experiences, OP.
My father adopted my distant cousin, who'd had a traumatic home life and lost his mother. I don't blame my father for doing what he felt was the right thing. But I do blame him for not fully considering the impact upon us.
My cousin was extremely violent and much of my childhood was hell because of it. My mum couldn't cope. I grew up, left home (he being older had already left hy that time) then later, he was rehoused nearby me. & he started threats and aggression again.
Due to his antics I ended up having to be rehoused, with 2 small children, miles away to where I knew nobody and had no family or friends support.
The whole situation killed my parents' marriage, and ultimately mine.
People can talk all they want about therapy. But unless you've had to grow up with someone living in your home where you're meant to be safe, who smashes up the home and then fights with you - then its hard to 'get it', I think.
& You never forget.
To be honest I'd feel same as you. I preserve my peace and won't have anyone tell me what to do.
A friend was telling me about a boy she'd fostered, holding a knife to her son's throat. She said thank God she got home in time as you never know, the outcome could have been terrible. I sat listening to her with my jaw dropping.
I'm not saying all foster children are violent. I am saying, do what you feel is best for you OP although sadly I think you may lose your family over it.
They've no right to bully you and minimise your experiences as they are.
You and what you've been through matter as much as anyone else does