Scholarship / I do believe in maximizing my potential for success. Major experience and its influence on me. [3]

You're response is well written with just a few minor edits needed as far as grammar goes. Since you're original response was approximately double the word limit, I did omit a significant portion while trying to include the most important phrases that responded to the prompt. Below is the edited version:

While volunteering at a local hospital, I was able to gain some insight into the treatment process and doctor's decision making process. This experience ultimately encouraged me to pursue a career in the medical field as well as sacrifice adequate rest and leisure time in order to obtain it.