I had to take some time away from school to sort thrugh different things I thought about pursuing. I needed to ask myself: can I spend the rest of my life doing this and enjoying it? and I mean, really enjoying it and feeling satisfied with my day's work. And secondly, can I make a living at this?
I looked at a few fields that required careful skills and tenchniques, but where you could also take those skills with you and be pretty independent. But, since they were in the arts (stained glass restoration, architectural conservation, textile conservation), I realized I could not support myself and my family in any meaningful way. Ok, so that was out.
Then I worked in business just make some money while I kept looking around. I had always wanted to go to medschool but somewhere in my head I had picked up the idea that "I couldn't do THAT!" and "I am not smart/rich/cool enough to do that ..." You get the idea. So I looked everywhere ELSE but where I wanted to be. Finally, after taking a finance course and overcoming my fear of numbers 😉 , I realized that this stuff was pretty do-able. And that's when I decided I'd had enough of my fears and insecurities and I was going to give it my ALL, and go for medicine.
I tested myself throroughly with clinical experience and took my pre-requs while working 40 hours a week. The more I did it the more I absolutely LOVED it. And the thing is, all my previous experience came right out as I went along. In fact, for me, I think that period of soul searching really helped to strengthen me and really prepare me for this journey.
So, yes, I think you need passion, but you definitely also need the nitty gritty of discipline, and incredible hard work and determination.
Sounds like you want to do it, so go for it !