I admire your perseverance and courage in managing these charged and difficult feelings. You have already shown a great deal of bravery by reaching out our group of PsychCentral therapists. Perhaps you are less afraid to ask for help than you think.
The university you are at has a counseling center that will offer low or no-cost therapy. I highly recommend you begin one-on-one counseling to start sorting through these feelings. Hating the person your mother is divorcing and displacing your anger onto others is something these counselors are trained to understand and help.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral