nc--i think the choice is simple..if you REALLY want to be a doctor, and of this you are 100% CERTAIN, why settle for anything less? if you are sure that you want to be a doctor, you will do whatever it takes to be a doctor of medicine, not a chiropractor, podiatrist, what have you..
FIRST: decide what you want to do with your life..wanting to help people is a bit vague..you can accomplish this goal by becoming a lawyer, a doctor, an engineer..
SECOND: if medicine is what you want, decide what kind..these days there are a host of disciplines to choose from--allopathic, osteopathic, chiropractic, alternative, etc.
THIRD: if allopathic/osteopathic, work on getting those grades up, getting more life experience..you are young, and if you want it badly enough you will get it..admission to medical school is not something to be rushed into..look into post-bacs for the grade problem, get a job in or out of medicine--does not matter--i really think you should try to avoid going abroad unless you want to always be pushing a boulder up a hill..if you are confident in yourself and motivated enough, you will achieve admission stateside..
FOURTH: choose the course with which you will be the most satisfied..don't settle for second best..numbers don't mean everything but you've got to produce some sorta number that will allow admissions committees to learn who you really are by taking a closer peek at page two of your app.
hope this helps
spunky