How are you supposed to fix it, if you don't know what you did wrong?
my cousin did something similar to his parents. One day, out of the blue he started giving them the cold shoulder and they wanted to know why. he drove to their house from another state where he was living and basically blasted them for...having him. and his younger siblings. told them they should never have had "so many kids" and that he had a terrible life and they set him up to fail, and a host of other sins he was convinced they had committed against him.
so they apologized - not necessarily for DOING what he was accusing them of, but because he clearly felt REALLY BADLY about some stuff, he had been harboring some resentments for a really long time and because they LOVE him and they HATED seeing him so upset.
But no one can go back in time and change things, and ESPECIALLY if we don't even know what we did wrong.
cousin eventually apologized to his parents for what he said, he acknowledged that it came from an unhealthy place and time in his life where he was seeking to blame ANYONE for the things in his life that weren't going smoothly or well.
But it was 2 years that they will never get back, you know?
I'm so sorry this is happening to you and I really hope that you can at least get to a place where you can talk about it. nothing gets solved by silence.