My mother is a bit like that. She says she is just worried and actually it might be partly true. She has married young and is not used to the way people build a career nowadays (she had the same job for 30 years).
I also feel that she doesn't think I am special. Maybe mothers have to be extra critical. It is their job. I don't know. She means well. So might your mother.
But you need your own space, your own life nevertheless.