Robby recommends the following next steps:
Level of responsibility
Length of time in debt
Available free time
When I was in high school I took a class where I shadowed different fields in the medical profession. I would highly recommend this because you will get an idea of what a day of work usually looks like.
I'm a current PA student, so let me know if I can help answer specific questions about PA education. To clarify, PAs practice medicine in all medical specialties and in all clinical settings, and about 1/4 of certified PAs practice in primary care. A simple search using the current professions should get you helpful information, including comparison charts which is useful. Shadowing could definitely be the next step, to get an idea of what it's like to work as a PA vs physician vs NP. I hope this helps.
PAs and NPs have a little more flexibility with regards to changing specialty. Several PAs that I have worked with in radiology have gone on to change to ortho, rheumatology or emergency medicine. An MD would have to complete a new residency to change specialties