Not liking how I am showing up

I hate every tradition in my in-laws home. It’s all rooted in patriarchy, and deeply religious and old fashioned. However I still find myself agreeing, and being polite and doing things that I don’t agree with – AT ALL. My tone is submissive, and I am trying not to rock the boat. I am not liking how I am showing up, how I am just doing things I don’t accept and am against, but doing it – because I am here for a sensitive matter so don’t want to bother anyone.

I want some coaching on how I can really stand up for myself and say no to things I don’t agree with. But I imagine if I do them – I will still go through the discomfort of being alienated, feeling the wrath of other people.