Seems a lot of us had problems with their parents.
Mine split up when I was eight or so, my Dad gradually lost contact with us, as my mother made it difficult for him to see us. This got worse after she remarried.
At seventeen, I left home. not exactly by choice.
My regret isn't anything to do with that - I suddenly had to make my own way in life, find somewhere to live, get work and generally get on with it. And I managed it. I had a lot of help from very good friends - we're now as close as family.
As part of this, I tracked my Dad down and got back in touch. Had a great relationship with him till he died in January 2016.
And that's my regret. I didn't have long enough with my Dad.