99% of us don't even know what a doctor does, just that he/she helps humans and makes great cash.
Are we allowed to become doctors on those assumptions
I'm in high school and I want to be a doctor, but I don't know what they do. I just like to help people and make some cash.
Is that bad, should it be allowed
I spent half to two thirds of high school not knowing what to do with my life. Then I was sick on the couch for a week and watched a MASH marathon, and said, "Oh, doctor. That looks neat. I bet I could do that."
I attached myself to the pre-med track when I applied to college, purely on the basis of MASH being a really good show, medicine seeming neat from my almost non-existant experience with it, and knowing that I could probably handle the academic work required.
The key was that at all points I remained open to re-evaluating my reasons for wanting to go to med school in light of new experiences.
Taking biology/physiology. Does this seem awesome? Yeah, pretty much -> Good, I'll probably find a lot of med school coursework at least theoretically interesting.
Shadowing and clinical volunteering. Does working in a clinical environment rate highly on an objective scale of radness and being super interesting? Yes -> oh good maybe I made the right choice
Taking organic chem. Did I get a C+? Totally -> who cares, it is a dumb requirement anyway.
That was my method, and I'm currently scheduling my 4th year of med school so I guess it worked for me. Generally, I'd say that you shouldn't trust anything based solely on personal anecdotes, but "always be open to re-evaluating your beliefs and plans as new information and experiences pop up and you grow as a person" is pretty universal advice.
Oh, and no matter how hard you want it, have two back-up plans for medical school. The first back-up plan is also medical school. The second back-up plan is something different that would still make you happy.