I constantly feel worthless , ugly.

I can't stop criticising myself, I feel ugly stupid dumb disgust and worthless all the time . I have been crying every day for atleast 1-2 hours for the past few months. I have upcoming exams and I can't concentrate on them , I feel totally worthless , my existence feel like a waste of time money and energy , there had not been one day I spent without crying my lungs out . I used to be an avid painter, writer . Now all I do is watch conspiracy videos on YouTube and binge on stupid snacks crying . Everyone calls me worthless . She told I am ugly and worthless . I can't dissolve that in my mind .she looks at very contemptuously , I can't stand it . Please help me I can't stop saying to myself that I am worthless