My mom doesn't respect my privacy
My mom would often open the bathroom while I'm taking a shower when she needs to use the toilet. One time she opened the shower curtain and stared at me...naked. Like wtf?? Weirdest shit ever. I complain everytime she opens the bathroom while I'm inside and she would always answer "I'm your mom I've seen 'that' before, why are you embarassed now?" And I would always remind her that I'm 18 years old and that she should respect my privacy. But she never listens. What should I do or say to convince her to not do this anymore?