GCSE Art

Hi there, art teacher advice, perhaps from another teacher?

my Art teacher is regularly telling me to change my artwork, telling me it’s awful. Last week, she ripped out a piece of my work, rubbed out my pencil drawing and, then told me to cover another fashion piece with newspaper, trace new designs on acetate and paint over them. She actually drew one and made me put it in my book. If I didn’t, I would get a behaviour point. This is so confusing. She gets so angry and shouts at me! Now I just want to re-do my whole sketchbook as it’s not my ideas anymore, but hers. I feel demoralised and feel like giving up. Is this allowed. If my parents complain, this will make it worse.