If you really want to be a doctor, go for it, but consider this: medicine has the worst residencies of all the medical professions. You can help a lot of people and make a lot of money being a chiropractor, dentist, optometrist, podiatrist, etc. without having to spend 5 years working 80 hours a week or more and barely holding on to your sanity. According to the published research on this topic, any suffer from anxiety and depression and make serious medical errors because of the lack of sleep during residency. That said, the hours are more reasonable in some specialties.
Many doctors are also burnt out because of various reasons — working hours, medicare reimbursement, malpractice insurance, etc. — and want to leave medicine. But I’m sure satisfaction differs tremendously from job to job and from speciality to speciality.