This should not be a difficult essay to write if you approach it from the perspective that the two roads in the poem are metaphors for the choices we face in life, choices that might be as simple as what movie to see, to the more complex decisions one faces moving into adulthood, such as choices regarding education, careers, marriage, etc. The difficult part about choices is the knowledge that you're passing up something that might prove to be the better choice--but of course, you'll probably never know for sure--this is what Frost refers to as "the road not taken." It's hard not to second guess oneself, particularly if the choices we make don't turn out the way we had hoped.
I'd simply like to remind you that while most people will dwell on the road he took, the title of the poem is about the path he did not take. While he may have been content with the road he chose (as we eventually all must learn to be), he looks wistfully back at the choice he made and the opportunities he necessarily lost.
While you probably now have enough for a great paper, perhaps you may consider analyzing Frost's poem as a light satire on indecisiveness. As post #3's reference notes, Frost wrote this poem about his fellow poet and friend Edward Thomas who waivered upon the choice of path for them to stroll upon as one might have had more flora than the other.
Choosing the lighthearted satire as a focus will probably be "the road not taken" by the majority of the other students in your class. How's this for a title for your analysis: A Road Infrequently Taken about Frost's "A Road not Taken"?
It’s telling us is to live with the choices we make in our life. If you look at the words of the poem, "Then took the other, as just as fair,/And having perhaps the better claim/Because it was grassy and wanted wear,/Though as for that the passing there/Had worn them really about the same," both roads are similar. It’s not a hard choice because one offers more challenge (less traveled). The challenge is making the choice, following through, and dealing with whatever that choice brings.
Check out my response at: http://www.enotes.com/road-not-taken/q-and-a/what-whole-explination-for-poem-road-not-taken-87797
You should find enough material for a great paper.