My lad is currently in his second year of med school and loving every minute of it. He decided back when he was 8 that he wanted to be a doctor and never wavered except to briefly consider research. He tells me (and others) that the time and effort spent “isn’t work when you love it.” He’s never been after any sort of money from the profession. He knows several happy doctors.
This isn’t to say there isn’t significant work/time involved or bad days or frustrating aspects, but merely that one ought to find their niche.
I half wonder if there are so many unhappy doctors because a good number of them went into it for the money or prestige or “push” from parents, etc, rather than making their own choice due to loving the job. It’s also not uncommon for folks to get into a job (any job) and burn out. Making a second life choice isn’t unusual overall, but there might be more “pressure” not to do so for doctors (vs teachers, etc) due to having a budget that requires higher pay or feeling they might lose prestige or similar.