Your parents are not "narcissists". They're typical authoritarian assholes who treat you like their property because society allows them to.
Your ex boyfriend is not a "narcissist". He's a typical misogynistic douchebag who treats women like shit because society allows him to.
Your boss is not a "narcissist". They're a typical classist dipshit who thinks workers' entire purpose in life is to generate profit because society allows them to.
And even if they happen to be a "narcissist", that's not what gave them the power to get away with abuse.
So stop blaming mental illness and start blaming society's normalization of abuse. Stop acting like someone has to have a mental illness in order to do something cruel when ordinary people have been doing atrocious things since forever.