Ugh! Moments

So I got pregnant out of wedlock, so didn't my other two sisters. We all 3 firmly believe that yes we should have been married but stuff happens. So my two sisters are pregnant again out of wedlock but both engaged and have been for years. My grandma decided to tell us girls that we have bastard children and their illegitament and she's embarrassed to be seen by us because she's so ashamed. She constantly tells us this. Goes on and on about how we made mistakes and that we're terrible people. I wanted to vent. Because she makes me feel like a shitty person for having my baby. And she says my mothering is wrong. That I'm not good at it and I should take classes on how to parent.. 😳 who says that?! What should I say or do?!