I don’t claim to know a lot, but as a man still struggling unsuccessfully with the responsibility to oneself, how can you decide to take up more by getting married and having children?

Hard agree! Some people say that they think it is "selfish" to not have children, but I think it's selfish to have children you do not want or are not ready to care for or because you feel social pressure to do so or so many other bad reasons people have children. I think children should only be had if they are really, truly wanted and loved. Children know when they are not. And if the parent is not mature enough to be a parent, they should work on themselves instead of jumping right in to having children, so that they do not harm their children with neglect or abuse.