I hate my step parents and their bastards

This is something I can't help but feel and I hate my parents for doing it I get that their relationship didn't work out well I'm not a idiot who believes that parents splitting up or finding new relationships is wrong. But I hate the idea that I have need to accept someone who isn't my birth parent as a parent and their offspring as my siblings. I'm respectful and I'm nice to them but deep down I hate them and it's insane that I'm expected to see them as a step mother or step father and that I need to see their children as my siblings when I never grew up with them or knew them.