My mom won’t let me (F16) shower by myself

I don’t know what to do. For most of my life I was never allowed to shower by myself, only a couple times a year, and if then I was not allowed to wash my hair by myself. The other times MY MOM has to do it. My mom has to come into the bathroom with me and do it. I was never allowed to put the shampoo in my hair, dry my hair, only my mom has to. My mom has to see me naked everyday. I’m nearly 17. It was okay when I was younger but I’m literally about to turn into an adult.

As days come I feel disgusted more and more, I feel as if I have no privacy. As I got so used to it I became desensitized to it, but now I’m starting to be aware how weird it is. I tried asking her before but she says no. And I’m too scared to ask her again because I feel like she is going to yell at me. I need help on what I can do. She does this to my 12 year old brother too. I just feel so gross. Why am I not allowed to have privacy. Am I just overreacting to this? For context I live in an Asian household and I don’t know if it’s culture or whatnot, but it’s still weird. I know other kids in my school do not have to deal with this.