Friends who treat friends badly

Hi everyone!
I have this friend who always claims to be my best friend but she treats me terribly. I can be a very outgoing person who acts like a dork when im in the right mood.
This so called friend often calls me dumb, stupid, and even retarded because of this. She also always tries to force me into doing things that she wants to do without asking me or making sure I even have an interest. I can tell her multiple times that i dont want to do something and she will repeatedly say things like "yes you will" or if I have something else I want to do "I wont let you." If I don't go to things she wants me to, I'll get a nasty text from her the next day. For example the one I got this morning after I told her I wasn't going to go to an event that was yesterday, was, and I quote "thanks for not showing up yesterday. That was really great." After I told her multiple times "NO."
She even signed me up for it without permission.
I am someone who suffers from depression and low self-esteemso when she does these things, I feel worse about myself.
She walks all over me all the time and I have no idea how to handle it. Right now I've kinda got her cut off by just ignoring her. I am a very nice person who hates to be mean so I don't know what to do in order to end this.
Does anyone else have this problem?