The poet says "I took the one less travelled by, And that has made all the difference." What is "the difference" that the poet mentions?

We all make certain choices in life.  Some of those
choices make life harder, and some make it easier.  For example: You have a choice
whether to go to college or start working after high school.  That choice will affect
the type of job you can get ,the amount of money you will make during a lifetime, and
your lifestyle.  It may even affect the type of woman you marry.  That one choice made
"the difference" in what your life was like.  In the poem, the poet has a choice of
traveling on two roads.  He took the one that was "grassy and wanted wear" -- but they
had both been worn about the same. It would be nice if we could see what going to
college and/or starting a job after high school BOTH would do for us, but we can't. 
Even the poet says  that "knowing how way leads on to way, i doubted I should ever come
back." to travel the other path.  The choice he made, made a difference in his
life.