I am unsure as to what level of education you are currently at, however it is important to keep an open mind. I believe one of the downfalls of having tunnel vision when it comes to a dream of working within the medical field is that it is very competitive and therefore it is important to keep our options open. Many students in 1st year of my undergrad believed that after completing their undergrad they would pursue a job as a doctor. The amount of students that were actually able to go on to medical school saw a dramatic decrease compared to the amount of students that originally has said this was the path they were going to pursue.
Definitely, explore your options. You may end up deciding to obtain your MD or PhD after completing your science undergraduate degree and become a professor. Perhaps, you'll choose to follow the path of research. These are just a few examples. It is important to get first hand experience.
See if there are any volunteer opportunities, shadowing, talking directly to individuals in the different professions (some of my professors were also clinicians..if they don't have time to talk in person send them an email?).
Now more than ever there is value placed on not only academics, but interpersonal skills and individual values. Some people do well on the MCAT and have the marks for medical school, but do poorly in the interview process. Challenge yourself to questions, such as why do I want to pursue a career in the medical field. These are questions that you will likely be asked.
Also I have noticed a importance being placed on ethics.
Ethics remains somewhat of an issue continuously and people are working on evaluating all possible situations to ensure that work is carried out in an ethical manner.