I live in a male dominated society

I live in a male dominated society, when I got my period for the first time o was only in the 6th grade. I’ve seen how my sister was treated once she got her period, she was not allowed to act like her age, to play, or to sit with our male cousins. Mom always said she hates girls and wished to only have sons. She said we can shame our family easily. Men are the opposite they cannot be shamed only if their “pocket was ‘empty” so I always wished to be a guy not because this is my identity, but because I did not want to be shameful. So, when I got my period I did not tell anybody- again I was only 12 YO- and I lived this horrible and horrific experience only by myself. Of course, I could not ask for tampons as I did not tell a soul about it, I used socks instead of tampons, I was really young and I did not want anybody to know. Our maid figured me out and told everyone. That was okay until today. I am 26 YO, and my sister shares this experience to her male friends (now we are older and have jobs and control over our lives) but when she shares it it hurts me, because I lived this experience not her, and I am the one to choose to share it or not right? When I tell her this she laughs and I get embarrassed and try to shush her but she keeps talking and everyone thinks this is weird.. what shall I do??