Okay, it's very rough. Almost too rough to really read easily. However though, i do see some things you can work with. I'm liking the new kid in school thing, but try to stick to the prompt more. Go with the world you come from first and then how it has shaped your dreams and aspirations.
Also, when you start to talk about your dreams and aspirations, mention obesity and bad eating habits first, that way you can kind of give the reader a hint to what may come. The you can talk about what you want to study.
Unique, Journey and hardship - the three words that pop up in my mind right after I see this prompt.
Unless you really like this line, I would take it out. It just seems kind of odd to respond literally directly to the prompt. This doesn't mean you have to take these words completely out of your essay, just out of that context. You can work them into your essay more effectively by answering the prompt.
For your intro i would maybe try to work in something about arriving in Miami after a long flight, something interesting that will entertain the reader but also relates to the world you come from; you feel?
One more thing, please work on your grammar. There are some very careless errors in there, it just makes you seem lazy when you don't fix them even it's just a first draft.
Good Luck