Upon meeting him for the first time, a friend's father asked me, "So, Briana what
This is written an a slightly messed up way. It presents it as though the father was "meeting him for the first time" because he said something "upon meeting him..."
You should write,
Upon meeting me for the first time, a friend's father asked, "So, Briana, what...
Let's work on the thesis statement:
Each of these experiences
has developed
or enhanced my interest in health care, provided me with goals to keep in mind when I am a practicing Physician Assistant, and challenged me to evaluate why I want to become a Physician Assistant. --- it sounds like the essay is about your experiences, but
if you ADD ONE MORE SENTENCE after this one before finishing the intro paragraph, you can make it so that the theme of the essay is your PLAN... not the way experiences have caused you to evaluate and develop your interest, but your real intentions. Your statement.
If you were allowed only one statement (i.e. one sentence) to express yourself to them, what would the sentence be?
I hope to one day be asked again what I do for this world, because--- excellent! This is a great theme.