Stop and think... your sister has said she was stressed with the hockey, you describe her as more compliant... did she continue with hockey to keep them happy, do you think?
Was her coping mechanism any better than yours?
Sometimes parents are so determined that their kids will have certain type of childhood that they arrange all sorts of things without really considering the child's perspective. You were punished for speaking out, yours sister was forced to continue with hockey for not speaking out... might that be true?
My parents would have looked perfect from the outside, they still look like perfect great aunts and uncles. But their focus is now, as it was back then, how we looked to others, how good we made them look.
At 50 I see tried, narrow minded 70 somethings who still have no idea why I am low contact with them. DH detests them for how they dismiss me so easily, but is pleasant enough to them as he agrees that they are, as they have always been, Essentially Harmless (to misquote Douglas Adams) and, as they live in another country, we don't have to see them much at all!
All I can suggest is that you stop seeing yourself through their eyes. That starts by identifying something you do, you love and are good at that they dismiss. Ponder it: why do they dismiss it? Why do you love it? Why should their opinion matter to you?
For me it was the realisation that they think they threw me out when I was 17 and spent years half supporting me as I simply could not cope alone. They did throw me out and within 6 months I moved 200 miles away and had no contact with them for 3 years. They don't remember missing me, they did not report me as missing, and I know it was 3 years (Live Aid up to the year before I got married).
They simply do not know the real me and the real me has been quite successful and is very happy, thank you. The 'me' they know is a total stranger to me.
You need to find that separation. It will be there. When you find it, even the slightest of cracks, the smallest difference (according to my mother I hate mushrooms, according to me I love them - that is enough of a difference to work with) work at it until you can easily spot their construct and get rid of it.
Good luck.