Parents Want Me To Sign Power Of Attorney Since Im In College... Yk How It Is. Does Anyone Have Suggestions For Alternatives And Backup Plans?

(I live in and go to college in California.) so ive just started college and my parents briefly brought up signing a POA. now, theyve so far only mentioned it is for "letting them step in for healthcare when youre (im) incapacitated", but the specific thing they brought up (the mama bear legal form bullshit) is a general POA that concerns me a LOT. i already know how questionable it is so please don't just tell me "DONT SIGN IT"- i already know that advice. my parents arent abusive atm in any traditional sense, but im currently hiding a double life from them (secret significant other, different political beliefs, yk) and like. if that was to all get out they may withhold finances from me. its all a big maybe.

+im financially dependent on them so. that complicates things a bit.

for added context, my parents are conservatives who believe the government should let parents have more rights over their kids and all that bullshit. as you can tell, i dont agree with them at all, though they have improved over the years and i dont 100 percent hate them. currently i am trying to keep a positive relationship with them until i become financially independent, so i really dont want to have a lengthy week/month long argument about this with them, especially over the holidays.

my current ideas for plans to handle this:
- i will try my best to not sign a medical POA because i dont like the thought of them knowing my medical shit, i dont want to argue too much and this is fine. i know a bit about the advanced directive option. i will try bringing that up to them first but if they argue against it ill settle for medical POA.
- i am under no circumstances planning to sign the general POA (especially financial and school records aspects) unless there was serious coercion going on where they threaten to not let me stay at home or withdraw finances... and at that point i perhaps have more serious problems, lol. but if they threaten me i think i may have to cave. i have no money of my own so theres little i can manage on my own.

my questions for this subreddit:

1. my parents arent 1000 percent unreasonable. is there any case i could make that would convince them to do advanced directive over medical poa? their main concerns are hospitals not telling them what happens without my consent in case of an emergency when im knocked out and cant say anything. my parents want to be informed at all times by hospitals right from the start of when something goes wrong.
2. if i did unfortunately have to sign the general POA, how can i get it revoked later on after i reach financial independence? is there a lot of paperwork? do i need the original documents (my parents would prob have those so. not great)? do i need to hire someone, how much would it cost? do i HAVE to make a new poa where i name someone else in charge of me, or can i simply revoke it without having a new agent over me?
3. also, what qualifies as "sound of mind?" if im hypothetically in the psych ward for depression, would that mean i have no say over what happens to me with a POA?

thank you from the bottom of my heart for reading all this.