No privacy 😭

Hi,I have no privacy in my own room.I get my parents pays everything and payed for my room too but this is so annoying,my mum comes into my room while I’m my school and looks into my drawers,she opens my window and opens my curtains too when I didn’t ask her to.After that she leaves my door open for my 2 year old sister to come into my room and to break/mess up everything.My sister broke something once because my mum didn’t close the door.

Today while I was revising my mum came into my room,opened my drawers and said “you can’t eat junk food all the time and not want to eat the dinner I cooked for you either” because earlier on I said to her that I didn’t want “dinner” when it’s my 4th meal if I have it. I asked her to leave my room but no,she kept shouting and moaning at me.

I bet you she looks under my bed and in my closet too,the weirdo.
And she’s the one that keeps making fun of my weight when the doctors said I’m a normal,healthy weight but my mum keeps telling me to eat everything she sees.

How can I stop her from going into my room without asking her to because I know she won’t listen?