I personally never bought into the "only go into medicine if your passionate about XYZ" thing or that "it's a calling." Personally, I'm not passionate about anything in medicine or patient care, per se. It's not a calling for me, I could happily do any number of other jobs. Instead I'm passionate about working hard, being the absolute best at what I do, being useful, and impacting other people in a positive way, etc... I think I could apply these passions to any field, even custodial work or trash collecting, and still find career satisfaction. I chose medicine because the positives outweighed the negatives more so than the majority of other career options available to me.
I think part of the problem with career advising in the millennial generation is that everyone has told us to go after what we're passionate about or interests us the most. The problem is that those passions and interests fade. IMO it's more satisfying to look at the practicality of our work, and find meaning that way rather than some fetish for bones/skin/the heart/eyes or feeling like you were born to hold a stethoscope etc...