How to deal with a narcissist mom when you have body dysmorphia?

Hello everyone I (21f) have BDD and face dysmorphia as well. I grew up as the ugly girl, therefore I never feel comfortable in my own skin.

I used to be overweight, I remember being so overweight in my high school graduation pictures that I could not look at them. I have lost some weight but I still do not look like the way I did when I was a teenager.

My mom is always finding something on my looks. She tells me that I have acne (i have 3 acne which went away and few spots).

Then today she told me that I was so skinny in my teenager years and sent me a video. She is telling me that I was so skinny that even my bones were looking better. Honestly I felt like shit. Idk what to do.

How to deal with narcissistic moms?