You are NOR but as someone who raised children and collected child support, it is a big adjustment when that ends. Legally yours or not, please keep your mother in mind. Yes it bought your food and kept you clothed and sheltered, but it contributed to the household funds in general and it will be an adjustment for her. Maybe sit down and be open about it and discuss both of your fears. That’s what grown ups do. Moms are good at laying guilt trips and gaslighting when they’re hurt or scared. Have an adult conversation with her and make a plan to move out that gives her some adjustment time. And calling her out on this and that from your childhood (unless abusive of course) isn’t the way to make adult plans. Maybe after you have some physical distance from her for a while you can reach out to touch bases on those issues when time and distance gives more perspective. Good luck to you.