The thing is, the kids didn't ask to be born. So yes, even as a regretful parent, it is your responsibility to try and raise kids to the best of your ability.

I hope that I can be there for my grandkids, should my child want to have kids of their own. I think one of the main reasons I am regretful is because of the lack of support I have / had. I don't want my child to have to experience it. I don't want them to have to go through it alone because raising a kid is fucking hard. But if you're regretful, it's even harder. I want to break the chain. I want to make a difference. I chose this and no matter what, I have to take responsibility.

Having said that, it all has to be within reason of course. I will help if my child also takes their responsibilities seriously. You can't have children and not be there. It is a give and take. And if there is no mending the relationship, it is best to part ways.