AITA for refusing to give my parents more money after doing everything myself growing up?

I (27F) have parents, but they were never really there for me. Growing up, I handled all my own paperwork, legal stuff, and even worked from a young age. They controlled what I could do, my hobbies, school choices, and even my college tuition. I had to figure everything out myself, taking out loans to pay for college and working multiple jobs to survive.

Even now, I am independent. Even when they had money and I needed it, they never shared it with me. I pay for their bills and send them some money occasionally, but recently they started asking for more. When I said I could not, they got angry, guilt-tripped me, and called me selfish. Then they ignored me for days.

I understand they are my parents and I have some responsibility toward them, but I feel like I have already done more than my fair share to survive and take care of myself. I want to help where I can, but I cannot keep being treated like I owe them everything after years of doing it all alone.

AITA for refusing to give them more support, standing my ground, and being a bit selfish for once?