Trainspotting author said he had never felt mature enough to settle down with a family and wanted to travel the world instead.Edinburgh-born Welsh split from his second wife Beth Quinn in 2017 and their divorce has now been finalised.He admitted he would like to have a grown-up son or daughter now but did not want to go through the process of bringing them up.The 62-year-old also said he doesn’t think he would have been such a successful writer if he had been a dad.He added: “It’s never been an