He was disappointed, and the glimmer of hope left the rims of his eyes as he walked away
"He was disappointed" takes away from the imagery of the second statement with its passive voice.
I handed it to the little boy
I thought he walked away. You definitely need to fix this. Otherwise, it makes the whole story questionable.
He smiled, and clutched it to his chest as if it was the most amazing thing he had ever seen
"clutched it to his chest" is not an independent clause. Therefore, you should not have a comma there.
There are times when I think about how my life would've been so much different if my mom hadn't chosen to leave the Philippines. Because of this decision, I've been given so many opportunities, and I feel so blessed to have been so fortunate.
What does this have to do with the point you're trying to prove? It seems awkward and unrelated.
achieve a goal
What goal? You need to be specific.
a larger process that changes this world.
What process? How exactly do you wish to change the world?
I thrive off of the knowledge that I can use what I've been given to have an effect.
This sentence is hard to follow.
ameliorate
This word does not fit in with your style throughout the essay.
I will accomplish this either by founding my own non profit organization or serving as a diplomat to an underprivileged region.
This is a good idea, but the ending is too abrupt. You need to closing statement.
Overall very good! You have some nice ideas.
(Could you please edit one of my essays? Thanks!)