Thanks for the kind words.
As for the diversity essays, I would say write about you and whatever makes you tick. Sometimes its hard to think about how you are unique if you buy into these generalities and describe yourself that way (middle class, white, etc.). Everyone has unique experiences that make up who they are as people and how they think. These can range from interesting hobbies, to experiences with siblings, to race or socioeconomic status etc. Really dig deep and think about why you think the way you do and what you can offer to a discussion.
A lot of schools can fill their classes with any combination of nominal social groups but in my humble opinion that's not who they are looking for. They are looking for unique genuine people who can come together, discuss issues and contribute in their own way to enrich the lives of their classmates and patients. In short, there is only one you, all you have to do is be transparent and articulate who that is.
And kudos on the baseball @dickfacedan ! (Its really hard for me to write that username without chuckling lol ) It sounds like that's contributed to who you are so I say go for it regarding the essay.