Why do you want to be a commercial pilot? There was a time when it was an aspirational career in terms of status, pay, and perks, but it's no longer the job it was except for some who are well established in their careers, and they are the last generation who will enjoy the job as it used to be.
Indeed, it has never been particularly intellectually demanding to fly an airliner. Your dad's 'bus driver' comment was incorrect as airline flying is much more demanding than bus driving in its complexity, descision-making requirements, and leadership demands. But it's a job you leave behind at the end of each flight. Just like a bus driver, train driver, or post man. It's demanding of course, and not everyone could do it, but intellectual it ain't.
Why not stay with Law, earn a shedload of dosh, and enjoy flying as a hobby, on your terms rather than some 'Michael O'Leary's' terms?