Scholarships aren't that easy to get even with the best grades in the world. Yes it helps for college - but it doesn't mean squat AFTER college. That's the point. Also - the grades don't matter in your point either way.
Well let your mom come at you after you are the age of majority there isn't much she can do. You call the cops on her if she does.
I think you need to check yourself at the door. Yes abuse does cause people to grow up and causes trauma. My mom was emotionally abusive and gone most of the time to see this guy she was cheating on my dad with. Luckily we had our dad. But we had to start stepping up on things like laundry and other chores with our mom gone and our dad working all the time. I helped out with taking care of younger siblings. I wasn't "on my own" though. You weren't either. You still had a place to stay and food and all that. Being on your own would have been your parents kicked you to the curb and you took care of everything on your own. I've been on my own since I graduated high school. More so after college.
I'm sorry for what you've dealt with but lashing out at strangers will not help you.

