In "The Road not Taken," how does the poet deal with an important issue?

In "The Road Not Taken," Robert Frost deals with the topic of human originality and uniqueness.  If one wonders whether or not it is possible to make a unique choice in life, the poem's answer is an unequivocal no.  Frost shows us this somewhat depressing idea with the narrator's description of the two roads and their symbolism.  He looks at one and then the other, noticing that the second is "just as fair" as the first (line 5).  Then in the next stanza, he says that they don't look the same -- one is grassier than the other, for example, but "the passing there / Had worn them really about the same" (9-10). So, the same number of people have traveled down each road, and, if we read the road as symbolic of two choices, this means that it is really impossible to make a unique choice because there will always be people who chose it before you.

In the third stanza, the narrator continues, saying that "both that morning equally lay / In leaves no step had trodden black" (11-12).  So, again, the roads are equals.  Then why, in the last stanza, does he say that sometime in the future, he will tell people the following:

"Two roads diverged in a wood, and I— / I took the one less traveled by, / And that has made all the difference" (18-20)?

He says this because he plans to lie. He plans to tell people that, many years ago, he had a choice and he took the tough road, the one that fewer people had traveled. However, we know that there is no "road less traveled." We want so badly to believe that we make unique choices that direct the courses of our lives; we want to think that we aren't the same as everyone else; we love to feel special and brave and original.  Frost essentially says that the best we can hope for is to lie about it because actually achieving this level of originality is simply not possible.