Mom Help please

The way my mom grew up is, you respect your mother no matter what, even if she's a complete bitch. That is her way of justifying how it's okay for her to slut shame me and call me fat. I have no clue what to do anymore, I can't justify myself cause then she'll start calling me rude and disrespectful. It got to the point I started to self harm, and now I have anxiety. I am 18, but I have no money and no where to go