If your family acted as if they didn’t want you or treated you like an outcast it would be best to disown them and move on with your life?

Just because they are family doesn't give them the right to treat you bad or worse than others. In my eyes, they should be treating you better. I cut out a few family members, after I gave them chances to change their attitudes. Then they didn't, they were gone from my life. No regrets either.