Undergraduate /
"A plane trip we took from Germany to London" - UF admission essay [19]
Okay, here's why your essay sucks.
First off, the beginning is way too dramatic for what you're about to explain. Your second sentence is a poor lead in. You don't say 20 of my friends or 30 of...; it's improper style for this kind of essay. Now you start talking about your travel gear and stuff, taking up a lot of space on something that is really unimportant.
RIGHT HERE, you have a crappy transition because you want to build up to the actual description of the flight. You just concisely told the story in one line and gave it away without ANY tension. Of course, as the other guy mentioned, it's not terrifying for a 13 year old by common reason to sit on a flight with a stranger. I had to sit on a flight with a stranger at age 9, totally alone (not the least bit scared), so what does that tell you?
Now, the next few sentences really are crucial in explaining how you missed the essay. Your friends walked past, and now there's no way out, you're TRULY alone and by yourself.
So, in your mind you're already presupposing that your reader has the same life experiences that you do; moreover, you're falsely assuming that the reader already has the same emotions and feelings in the back of their mind when they're thinking of the situation in the plane, which is just a huge crack in the essay. You're probably thinking of the immediate situation on the plane and all the thoughts you were having at that very moment, but you missed the background that can help to convey to your reader exactly what is special about this plane ride and the events' soon to transpire; you're not helping your reader imagine how to feel in those circumstances; you're failing at the setup and barging forward, which just takes the rest of your essay off kilter. That is another issue in itself and there are more problems to point out, but this one already derailed your essay.
You're predisposed to thinking a certain way about being alone, based heavily on the circumstances to follow, which is distorting the way you rehash what exactly happened.
A suited Indian man, probably in his mid-thirties, took the seat adjacent mine, and shielded me from what I thought to be my last attempt at escape from a potentially life threatening situation.
This is about as far a trained reader has to look at to discard the essay. In fact, it was as far as I got without totally discounting the essay. As I was reading it, I liked the description of how the man appeared and took his seat, but I read the rest and knew the rest (of the essay) was not going to be a pleasure reading.
He shielded you from what you thought was a life-threatening situation?!?!?? You said nothing whatsoever about an imminent danger and it becomes apparent to the reader that you are hiding some underlying feelings, and the reader thinks they've been setup, and the author has done a terrible job of misleading them into an innocuous situation where there was important background left out. That, precisely, is where you screwed up.
You ought to practice this kind of thing, and eventually you'll learn how to make words flow together logically and coordinate in concerted fashion to focus in on one main topic. As is, you can't do it.