It makes sense that you're feeling scared and maybe even angry about this. It's a huge thing to process. Maybe talk to your parents about a Second Opinion Appointed Doctor (SOAD) they're typically involved to review the treatment's necessity. Hate to see you in an institution during the Holidays.
Of course, This isn't forever. The team will work with you to help you get stable and feel better so you can come back home. Look me up if you ever need someone to talk with or vent.