My Lawyer Father Made Me Sign A Durable Power Of Attorney When I Was 19. What Are The Implications Of This? Can I Revoke It Without His Consent?

I (32F) was made to sign a Durable Power of Attorney by my parents when I was 19 and in college. I didn't care at the time and merrily signed over what appears to be the rights to all of my finances, medical information, etc to both of them. Thankfully it appears that this only kicks in when I am deemed incapacitated by a court or a doctor.

My father is a lawyer (currently non-practicing) so he's always been a little extra about this stuff, e.g. drawing up a contract any time I borrowed a small amount of money from him. I really didn't think anything of it at the time and he told me it would make things easier if I got into an accident or ended up in the hospital when I was in college. This was 2011 and I trusted my dad so it did not occur to me to ask anyone on the internet for advice. The document was originally signed in Massachusetts where we resided at the time. None of us live there anymore.

Now that I'm 32 it makes me very uncomfortable that my parents retain this kind of power over me if I were to become incapacitated. I am not married but I'd prefer to hand over control to my brother if that were to happen. My parents are divorced and are not on good terms and the thought of them fighting over what to do with all of my assets or when to pull the plug if I were in a coma makes me feel a bit sick.

Just for the record my parents are not and have never been abusive. I've read other threads posted by kids asking for advice on this topic and every response was basically calling the parents abusive monsters but that's really not the case here. They've never tried to take any of my money or assets (they are already wealthy) or expressed any desire to control me as an adult. They've never tried to access any of my bank accounts or medical records.

What can I do here?

Also, is it normal for healthy young adults to give their parents power of attorney when they go to college? Is this just a basic common sense measure for college students like I was lead to believe or is it unusual? What would happen if I were to get married and become incapacitated—would this document give my parents decision making power rather than my spouse?