At 20 years old I was unsure about what to do with my future. I was not a traditionally good student, dropped out of high school ,though I finished it up at nights, I had some run ins with the law (minor stuff) and was working during day and attending community college at night. My schedule was just to busy and had to make a decision, stay on as plumber, which was good work and brought a good paycheck, or continue on with school. I ultimately decided on school because I liked science and felt I could help people, also getting out of work the van in the cold months to work in the cold all day really sucked.
I finished undergrad, needed a masters to get into med school, did an IM residency and the reasons I went into medicine have nothing to do why I enjoy it on a daily basis.