Acquainted With The Night

I really liked this poem...along with every other Robert Frost poem.  Something in the first four lines caught my attention; although, I may be reading two much into it.  In two seperate lines he wrote, "I have outwalked the furthest city light" and "I have looked down the saddest city lane."  Outwalking the furthest light would be entering a darkness, while the saddest city lane is more despair.  These things were two different things with seperated ideas.  Darkness and sadness were two different things, which I thought was very interseting.  But then again, maybe he was just orlaborating on the darkness.
I also felt some condradictions in this poem.  In line 5 and 6 Frost makes it sound like he is embarrassed or ashamed.  But every other line in the poem is more understanding or just admitting.  But maybe that has something to do with the tone of the poem.  He wants to show he understands the shame built in with going so far into the darkness and seeing ultimate sadness.