Remember that right now, you're getting an education, and not job training. Rice isn't going to teach students to be doctors, but it will teach the skills needed to think, to address and solve problems, which will be invaluable in whatever profession you choose. Everyone is different, each with something special to contribute. Know who you are, have a vague idea about where you're going, and be yourself. There are more options than ever in the world of science, you just need to figure out where you fit in best.
Someone needs to help develop and implement the courses.
If you like to interact one on one with others and know that you are playing a direct role in the health of others, this would be a great career. A physician is responsible for the diagnosis and initiation of treatment, but won't always be there to see the result. A physician should have an excellent grasp of science and medicine and great people skills to interact with many different types of people. If you're interested in serious science as well as teaching, this would be great. A specialist is like a detective, responsible for knowing an incredible amount about a specific area and then applying that knowledge to hunt down the cause of the problem.