Questions: Family & Friends

Hi, I am 18 years old I have a strong feeling that my mom is a toxic person. in 2021 my mom have been acting very toxic to me every since my sister went to collage, she keep telling me "I am here for my sister" every own and than.(no, she doesn't mean like a sibling) to me it sounds like am my sister slave or maid, and that's the only reason I am live. let me explain why I believe so
1.) she makes me do MOST of the choices
2.) call me MORE than my sister (, even though my sister is in the SAME room as her)
3.) every time my sister doesn't do her chores I have to do them or help her with them, but I don't get help.
4.) they both always team up against me in arguments. (Even went they are wrong)
5.) my mom would tell my sister to do something forget (because my sister will never respond to her) she calls me multiple times, or bang on my door to wake me up after she told my sister to do it. even to this day she have been doing this!!! Am trying to find a job to do online and make money so I can move out. this have destroying my mental health, and even made me have more anxiety.
I will be happier one day, just not in this house.

Please read before commenting.

pretty much a few months after I turned 18, my dad started telling me that I needed to start buying more of my own food. I had a part-time job at the time and still do.
He said I would always get three free meals a day though, but I needed to start buying my own snacks. Fair enough.

But now he's telling me I need to start buying my own milk, basically the only thing we can eat for breakfast is cereal and oatmeal (unless I buy something else). I bought my own cereal, but how am I supposed to eat it without milk? Doesn't the milk kind of tie in with the three meals a day that I get for free, like my breakfast? Little by little he's starting to make me buy all of my food.
I'm trying to save up for a lot of things right now like a car and my insurance I'm going to have to start paying soon, I have very little money to buy my own groceries. If it was just the milk it would be okay, but he keeps adding on.
I am so hungry most days. I go to bed hungry because the ramen noodles I bought aren't that filling for dinner 🥺
It's not like I'm a 30-year-old still living at home. I'm literally 18.