If you're even somewhat interested in medicine, I'd just suggest shadowing a physician and talking to them to see if you like what they do.
For me, although I'm pre-med, I'm choosing medicine because I couldn't see myself being happy doing anything else the next 40+ years. Medicine offers a cool blend of biology and caring for people, which to me is something I'd enjoy doing and find rewarding day in and day out. It sounds cliché, but that's actually something I'd love in a profession accompanied by a lot of stress. Using your knowledge, training, etc. to change someone's life for the better, and knowing you made a difference.
Medicine also is one of the few career areas where you can get a degree and be virtually GUARANTEED to potentially make 150k+ (depending on your specialty) after completing residency. Other careers require you to move up the ladder over the years, and even then you'll be lucky to be compensated that well. A lot of specialties in medicine have sporadic hours, and various call shifts which is something to consider. I want to go in to family medicine though, which is ideal for having a family in the future. It doesn't pay as well as other specialties, but it has relatively normal work hours, and weekends off.
Those are the reasons I'm going in to medicine. Like I said, if you're interested in medicine I'd suggest shadowing a physician. If you're only interested in money, then medicine is NOT a career you're going to enjoy. Like others have said, there's way better ways to make money than medicine.