Im 18, My Mom Wants Me To Sign A Power Of Attorney/conservatorship Over To Her

Location: United stated, California

I turned 18 recently and my mom is wanting me to sign a power of attorney (or conservatorship) over to her. I live in California and I am part of regional center. I live with my parents and my mom is considered my primary caretaker.
My mom has been telling me since around the end of my senior year in hs that she wants me to sign a power of attorney or conservatorship over to her but I’ve been hesitant on it and refusing even if she continues pushing. Soon we may be going to visit a notary (against my wishes)
She’s been “dumbing” down my disability since I was young so she could earn more money from my regional center benefits. She has told me it’s to help us because we’re not entirely financially well off even with my father’s income.
I suffer from mental health issues and have been in and out of hospitals, now that i’m 18 my mom says I should sign something so she can still earn benefits and so she can help me in case I go to hospitals. She also says she needs it to make medical appointments for me and to take me to school.
When I tell her “no” she continues trying to persuade me. Sometimes she gets really mad at me over it and says i’m “not able to function for myself” and that I “can never live on my own”. I like to consider myself very capable, i’m able to cook small meals, clean, maintain hygiene and generally do things for myself. I don’t know why she wants this. Sometimes i’m scared she will shun me in the family or kick me out if worst comes to worst.

I don’t want to sign any binding paperwork or have my parents kick me out over this. Is there anything I should do? Should I sign this?