You've described your situation well. It does sound extremely difficult to bear.

I don't know if you live with your mother or what your general age is (which somewhat affects what we can expect our mothers to think they can get by with saying to us.) Not that what your mother is saying to you would be appropriate even if you're a teenager, but the best way to go about getting your mother to stop doing this may vary depending on your age.

I don't know if you feel comfortable sharing more info?