Don't become a doctor
primarily for the money. Medicine requires far too many sacrifices - consider that if you enter medical school at 23, you won't be a practicing physician until at least 30, possibly until 33 or 34, and you won't be a highly paid physician until at least three years post-residency. So if you want to be an orthopedic surgeon, you won't be making loads of cash until 36. That's after at least nine years of training, which is certain to be physically, mentally, and emotionally draining. Other careers paths are draining as well, but they usually don't require you to make life and death decisions at the end of a 16 hour shift.
Make sure that you do a few things before you decide on medicine; first, volunteer in a hospital (hopefully an Intensive Care Unit) to determine if you can handle working with sick people. Many people underestimate the importance of this - it's not easy dealing with grouchy, demanding people with many medical problems, who you may or may not be able to help. Second, shadow a physician (preferably two or three), and as you shadow this doc, talk to him/her and his/her partners about their thoughts on medicine and their jobs. I heard nothing but negative opinions on the future of medicine from people until I shadowed an ER doc and talked to him and his colleagues about medicine - four of the five doctors (an orthopedist, two trauma surgeons, and two ER docs) encouraged my medical aspirations and would enter medicine again if they were recent college graduates. One of the other doctors, however, hated medicine - not because of what he could do, but because of what he cannot do for the multitude of uninsured patients that he can't help, along with the boatload of paperwork that drags down every shift (among other issues). Third, before you decide on medicine, look at other careers, both in and outside of the health field. Do you like science and working with people, want to make a lot of money, but aren't wedded to the idea of becoming a physician? Become an orthodontist. Those guys are given money machines as soon as they graduate. Also read about other careers, and maybe take a "what type of job should I get" test. It won't pinpoint what type of career path you should take in the future, but it may help you think about what you want in life and how should go about getting it.
Good luck, and keep in mind that medicine isn't worth it simply for the money; make sure their are other reasons that you want to be a physician other than the paycheck (which in the long run will probably not be as big as you thought it would be).
