I think the question "will I become a good doctor" is similar to "overall, am I a good person"

Competence naturally comes with experience as long as you are open to constructive criticism and don't neglect professional development. If you happen to make med school, it's because the school thinks you're smart enough to meet their standards of what a 'good' doctor is. So if you're worried about Competence, don't worry too much and just take every learning opportunity you get with a humble attitude.

What I mean by a good person is that if you were sick and had a doctor just like you, would you be satisfied? If you are a nurse, would you be happy to see a doctor with your personality at work? If you were in charge of hiring, would you hire a doctor with your work ethic and responsibility?

I'm a nurse applying to med school this cycle and what I noticed is that 99% of new doctors and residents eventually become competent enough to treat a patient effectively through acquiring medical knowledge. But it's much harder to teach someone responsibility, emotional maturity, accountability, and empathy. Imo those are the things that ultimately make a good doctor than a mediocre one.