How do I cope with my emotionally abusive mother?

I am 19 and for the past 4 years or so my mother has been very emotionally abusive. Due to her age, I assumed it was a menopausal thing, but she continues to be hatefully and uncaring. She is constantly yelling at me about how I am incredibly useless and how I am a failure in life. Usually I can brush these hatefully things off, but recently I have found myself falling into deep depression because of her. I have never felt more unloved in my life and nothing I do is ever good enough for her. How can I deal with her and the emotional pain she is causing me?