What should I do?

26F with an undergrad degree working in the Education field, I live with my parents and younger brother, we are low income family, mother is unemployed. So I’ve stayed living with parents to help with bills, but living at home is very stressful, my majored stressor is my mother to a point where it affects my mental health, my plan is to move in the next 3 months, I feel bad for leaving them since they struggle financially and my younger brother needs me but then I’m doing it for myself, my mental health and happiness. Any suggestions as I feel bad for taking the next step? But then again is for my well being.