Thinking about cutting off bio family

I'm at the point where I think I want to just cut contact and move on with my life. They're so abusive and dysfunctional on both sides, my bio mom is toxic and keeps trying to drag me into her drama with her stepdaughters, half-sisters are awful too. I'm thinking about completely leaving the family, deleting people from social media, etc. I feel guilty though because they're "family" (but not really), and can't bring myself to do it. Don't know how to handle it.