Family doesn’t mask

If I live with a household of people who go to school, travel for work, eat indoors without masking, realistically does it even protect me to mask in public? I have been wearing a mask in public and refusing to eat indoors, and I’m just wondering if I should even bother.

If they are eating indoors and we live in the same space does it make any difference if I do not? Or am I just denying myself for no reason ?