Making separate bank account

I have a card under my moms name, it’s a debit card, so she sees everything I’m spending where and how much it is. I am over 18 and I think it’s time I made one separately as I gets annoying with her questions and telling me no i shouldn’t being spending my money one what I want. I also have another card that my older brother sees everything and he’s also very strict and overprotective as he questions where I’m speaking my money. I don’t spend it on anything bad, literally only on clothes and food that’s it. So how do I make my own separate bank account so I can manage my own money without them looking?