You have a really compelling story here, and I think this will make a great essay.
My main concern is- and a thousand pardons if I am wrong- that it sounds as if you spent too much time with a thesaurus or the synonym finder on Microsoft Word while writing it. There are certain phrases that sound not only awkward, but unnatural: for example,
"Pining for complete mobility, I would often find myself gawk at the facileness of how others walked."
I'm fine with "pining". I'm even fine with "gawk". But "facileness"? I don't know about you, but "facileness" is not the first word that comes to mind when I see someone with a graceful walk. In this case, I think "ease" would sound much smoother.
Your lofty lexicon aside, there are some changes I would make to the structure of your essay. You could probably get rid of your first paragraph entirely or combine it with your second paragraph, since it does nothing for your essay except introduce the concept of challenges, which is already explored in your second paragraph. As for your fourth paragraph, the abstract comparison to a large spinner is interesting, but it could be considerably shortened. Also, I'm curious about your physical education award- what was it? How and why did you win it? If you're going to mention it in your essay, you probably should elaborate a little more.
As for your conclusion, I would consider everything past the sentence "Those are the things that have gotten me to this point" to be the strongest part of your essay. However, I would get rid of the "hey" in your last sentence- that colloquialism just doesn't seem to fit in with the rest of your essay. I would also change the first sentence of your concluding paragraph- "heeding to the image" is a strange-sounding and confusing phrase. It would probably be better to say something like "When I look in the mirror, I don't see physical brawn. But I also don't see the things that like beneath my skin through years of enduring [...]"
Rebecca L.