See Screen Name. That said, do not even think of Medicine unless you have wanted nothing else in your entire life, and are willing to sacrifice EVERYTHING in your life to achieve it. There are A LOT easier ways to make money (Like large scale, high end business restructuring consulting -- for example
) that do not so dramatically and directly alter people's lives, including your own!!!! Obviously NOT the career for you since you are asking the question. But thought I would do the polite thing and answer. Best of luck in your search, but remember, if you do not love what you do, it will always just be a job, and you are likely to not succeed to your fullest potential at it. Find what you LOVE, do it, and it will never be "work".
as do a lot of other people I know 
Career progression can be an involved process over a long period of time and what you make a start in in will almost certainly not be what you finish your career in. My advice would be to not put too much pressure on yourself to find your 'perfect' career immediately but check your interests out and see what develops. I'd also advise you to meet with as many people as possible in areas that you are interested in as you never know where it can lead.