Family trip

Hi in need of some advice. Im 20 and have known i was trans since i was 14. I have w younger sister and came out to her in 2020 and she has been very supportive ever since. However i only came out to my parents 2024 december. My dad is supportive i would say, uses he/him and my name but my mom is different she does use he/him but always either gender neutral pet names or my deadname with a male ending (my language is gendered) and she also constantly seems to start fights about it. My mom is also really really controlling when it comes to everything. This weekend we will go on a first family trip since my coming out and we always go to waterparks, it’s like my family’s thing. Now whwre i need advice: how do i avoid my parents for ing me to go to the women’s changing room ? I would prefer to go to the mens one(i go to the men one in the gym all the time) but idk how to tell them that without being yelled at or something. I’m a bit over a month on T at the moment, but there’s not really any changes yet and i look kind of androgynous so idk:(