Nightmare at New Job

wasn't being challenged by my previous job, so at the advice of a friend took a position at the company she works at. Its been a nightmare, my direct supervisor has used intimidating , threats, and treats me differently from other staff. I started in March, I was told it takes a year to really understand the job, have been on my own for 2 months told I was doing well now this week its how terrible I am. She jumps at every opportunity to make me feel worse, changing my words, and when I attempt to correct her she speaks over me, I really wish I had never resigned my old job.