AVOID "I", "ME", AND "YOU"
Remember that the topic of your assignment is the subject.
When you use 'I', YOU become the subject. The focus moves away from the topic and onto you. Sentences like this are not appropriate:
"This essay made me sick to my stomach. I couldn't believe what I was reading."
This tells us nothing about the topic, only that the person writing about it was sick and in disbelief.
Likewise, you should not say:
"This essay will make you glad you live in a time and in a country where you don't have to worry about famine and poverty."
This shifts the focus to the reader. There's an involuntary, unconscious response; the reader thinks "Who? Me?" In this version, the important thing is not 'the essay' but the fact that the reader is going to be glad he or she lives in the U.S.
So what's the right way to do this? There are a couple of options. You can put it in terms of readers:
"This essay will make readers grateful that they live in a country where they don't have to worry about famine and poverty."
Or you can use the more formal sounding "one."
"This story will make one grateful to be living in a country where they don't have to worry about famine and poverty."
But that's not my favorite solution. Ultimately, if you have this dilemma, you should reconsider what you're trying to say and put it in a way that maintains the focus where it belongs--on the thing being written about:
"After reading the proposal presented in this essay, we can be grateful to be living in a country where they don't have to worry about famine and poverty."
And notice how the use of "we" creates an inclusiveness. The writer (that's you) and the reader are brought together as participants in the experience.
DON'T REFER TO PEOPLE BY THEIR FIRST NAMES
Unless you know someone personally, you should not refer to him or her by their first name. If you're writing about Shakespeare's Hamlet, you don't say
"In this play, Bill raises the question of the ethics of suicide."
Likewise, if you're writing about Tom Cruise's performance in Mission Impossible you wouldn't say
"Most critics panned Tom's performance in this film."
The most commonly accepted way to reference a writer is by his or her last name:
"In this play, Shakespeare raises the question of the ethics of suicide."
or
"Most critics panned Cruise's performance in this film."