Ever since I was old enough to immerse myself in magazines such as Time, National Geographic, and Scientific American,
This is a good sentence. The whole essay is very good. I like the concept, and I like your way of thinking. You are like others who commit to serving those who are suffering -- Thich Nhat Hanh, Mother Theresa, you are in good company!
So... can you make this longer by talking about areas in which you want to specialize? What will be your specialization, and what specific goals can you discuss? I think you did a great job already, but this seems so short. Is there a word limit, or can you write more?
If you have room to write more, you should add another sentence to the end of the first paragraph so that the thesis will express a theme that covers all subtopics of the essay. If you intend to add more material, add a sentence after this: "...bringing medical attention to places that are drowning in poverty and war. (add a sentence here)
:-)