I never truly realized
delete "truly", it's awkward.
kids who I did not personally know me
change it to "kids whom I did not personally know" or "kids who did not personally know me".
I get the right to say
wordy. something like "I can say" will do.
people lives
people's lives
a few more grammatical errors.
the essay is nice, but needs to be more interesting to stand out, considering you're applying to Cornell. And beware of "self-righteousness". Something like
I was very smart
and
I would be great candidate and one you would be proud if selected.
is unlikely to win admissions officers. Show, don't tell. Perhaps you could write about one specific occasion "you truly helped somebody".
Apart from that the essay is well written.
PS. Take the opinions with a grain of salt.
This is my first comment thread, and I am applying to Cornell too, but to Arts and Sciences. I am posting my new thread this evening (a couple hours later) and please comment when I post them.
And finally, good luck with your Cornell application :-)