AITA for not donating my kidney to my brother after he bullied me for years?

[Clark]

https://www.reddit.com/r/AITAH/comments/1ft09pm/aita_for_not_donating_my_kidney_to_my_brother/?rdt=52736

AITA for not donating my kidney to my brother after he bullied me for years?
I (27F) have an older brother, lets call me Jake for privacy reasons (30M). Long story short.. we never had a good relationship. Growing up, Jake was always the favorite. He was good at sports, popular, and got all the attention from my parents. Meanwhile, he made my life hell. He would tease me, eg call me names, and even hit me sometimes. My parents never took it seriously and always said, “That’s just how brothers are.”
When I moved out for college, I stopped talking to Jake as much as possible. I tried to move on and build my own life. I thought I was finally free of all that crap I went through lol. It turns out now Jake is really sick. He has a kidney problem, and he essentially needs a transplant to survive. I am sad, shocked stressed and confused. My parents called me a few weeks ago and asked if I would get tested to see if I’m a match to donate one of my kidneys to him. They said it’s my duty as his sister to help, but after everything he did to me growing up, I am not so sure how I feel. They keep calling me selfish and saying I’m letting my brother die just because I’m holding a grudge. Jake hasn’t even apologized to me or reached out. It’s like he still doesn’t care. Ofcourse he is my brother and I love him but my health isnt the greatest too and I worry about the effects this might have on me if I go ahead with him.. but the thought of losing my brother makess my heart break.
Now I’m feeling guilty. My parents are making me feel like a bad person for not helping, but I don’t know if I’m in the wrong.
AITA for not really wanting to donate my kidney to the brother who bullied me?

[Clark]

Comments are surprisingly on point and tame for Reddit, especially AITA.