I was pretty undecided between medicine and dentistry, to the point that I took both MCAT and DAT. I'm a career changer and I received some really good career advice from an old colleague. He said some people live to work, and some people work to live. I realized I was in the latter category, and I felt like dentistry was more aligned with this.
There's a post I read on a forum several years ago, but I still return to it, whenever I'm feeling uneasy in my career choice:
That's not to say that you can't find balance and happiness in medicine, but medicine requires a lot of sacrifices. I didn't want to sacrifice time with my family. I didn't want to sacrifice traveling. I didn't want to do a residency and work 80 hours a week. I just didn't think a job, even one as cool as medicine, was worth that for me personally. So instead I explored dental and PA routes. I think it will still give me a lot of the things about medicine that excite me with fewer sacrifices.