Haha, yeah I am in medical school (I usually assume that much is implied, though I know itās not always evident across random keyboards on the internet). 
Iām in my first year of medical school, having just started in August. Itās a bit early yet, though my intention (hope?) is to specialize in cardiology. Heart disease is, forgive the pun, fairly near and dear to my heart. 
I didnāt really come from anything resembling a learned family, and so going to college at all was fairly novel. I graduated with my first degree and, like many, realized that the degree I had earned (Spanish literature) served effectively no utility in finding gainful employment.
And so I worked at a grocery store for a while and, upon random chance, jumped at the chance to become a high school teacher in the inner-city for several years. I taught science and some Spanish and, thoroughly burned out by the end, opted to jump ship to further my own education. Figuring I was then too old for medical school (lol), I got a degree in physical therapy and worked in that field for a bit.
But, the heart wants what the heart wants. And the itch, not having satisfied itself, I left that field to go back to school, working in restaurants and other odd jobs to make the schedule feasible, taking classes where I could, and finally got up the gumption to apply to medical school.
I can very much relate to that. I have at least one sweater, and career, older than some of my classmates. :-/
Ultimately, I think itās helped keep me young a bit, though thereās no denying a bit of a gulf between chipper young 20 year-olds and feeling at times like a gray-maned elder. But for the most part Iāve chosen to see it with a bit of mirth and good cheer. Everyone is whip smart, and still full of gleam in the eye and all the other trappings of unvarnished youth, and there is something to be said for surrounding yourself with that to some measure. 
Itās still early, though I can say that having a bit of age, and experience, really starts to come in handy once youāre dealing with patients. It wonāt be evident at first, and youāll likely feel at least a bit out of sorts in the early pre-clinical phases, for lots of reasons. But by much of the same token translating that into point-of-care is leagues easier (than seems to be the case for many of my classmates). Hard to deny the gravity of age, in some senses. 
Textbooks are textbooks, and lots of my classmates are every bit as good, or better, than I at all sorts of memorization tricks and the like. But, as Iām sure will be the case for you, once youāre in a clinic, or bedside, interacting with human beings, the game changes noticeably and the wealth of experience and touch really comes into the fore.
At the very least, thereās not much hiding from it. Iām in no position to evince advice, but if I had any itās essentially just to keep the faith. 
Oh man, it does sound delightful. I canāt say Iāve ever had much occasion to make it to the Caribbean just yet, aside from a short jaunt to Cuba a few years ago, though it is for sure on my short list. I fear that school (and the strictures of finances) will keep me pretty well yolked to a short leash for at least the next year, sadly.
For now, the financial aid Gods rule the roost and I live a fairly ascetic life, comprised mostly of Anki and medical ephemera; Missouri is no St. Martin, that much is certain 
What about you? War correspondent turned inveterate doctor? Surely you contain tales to tell, I imagine?