Experience with my donor conceived sister

A few years ago I told my donor conceived sister that she was donor conceived - we met on Ancestry. Her parents hadn’t told her, so I was the one to tell her and she has taken the news extremely well considering how life altering it must have been. She has decided not to tell her parents she knows about her conception because she doesn’t want to change the dynamic which I understand but I also feel a bit… something, I don’t know what I feel, maybe resentment? She is very heavily involved in my life, sometimes comes to family gatherings, knows my friends, and my parents helped her with her career. It’s crazy that I will never know or meet her family or truly know her life the way she knows mine. Just wanted to share.