Here's a breakdown the way I see it:
I walk a lonely road <= Character is alone, alienatied
The only one that I have ever known
Don't know where it goes
But it's home to me and I walk alone <= May find some solice in being alone (note the use of 'home'); community in not belonging
I walk this empty street
On the Boulevard of Broken Dreams
Where the city sleeps
and I'm the only one and I walk alone <= Repition of alone
I walk alone
I walk alone <= Repition of alone
I walk alone
I walk a... <= Repition of alone
My shadow's the only one that walks beside me <=Personification, shadow walks, only community to belong to is shadow
My shallow heart's the only thing that's beating
Sometimes I wish someone out there will find me <= Seeks Community and belonging at some point
'Til then I walk alone <= But doesn't really mind being alone; or doesn't have a choice
Ah-ah, Ah-ah, Ah-ah, Aaah-ah,
Ah-ah, Ah-ah, Ah-ah <= Vocal solo
I think this is where a shift in tone occur
I'm walking down the line
That divides me somewhere in my mind <= Choice ?
On the border line
Of the edge and where I walk alone <= Fear taking hold
Read between the lines
What's fucked up and everything's alright <= high modality in the word 'fucked'
Check my vital signs <= The city is so lonely he has to check to make sure he' still alive
To know I'm still alive and I walk alone
I walk alone
I walk alone
Repeat Bridge & Chorus <= Repetition
Another Summary:
Armstrong called
Boulevard the 'hangover' song, and that's pretty much what it is. Coming after
Holiday this song describes the feeling of loneliness that Jesus of Suburbia has to face after the party is over. After finally breaking free and entering the City, Jesus was excited and filled with expectations. But now the holiday is over, the confetti landed on the floor and the intoxication is wearing off - he looks around and finds himself alone on the street of the heartless city, empty in the morning darkness. Everything around him seems lifeless and only his vital signs prove that he's not dead as well. He's all alone...The phrase "I'm walking down the line that divides me somewhere in my mind" could be considered the beginning of St. Jimmy's appearance - Jesus doesn't want to be weak and vulnerable anymore, he wants to change.
Of course, there is more to this song than just Jesus' emotional hangover. Walking a lonely road is not only a one-time realization of your loneliness. Going through life on your own you get so used to the solitude that this lonely road becomes your home, and your actual life. Most songs about loneliness are a scream for help, an expression of despair and fear of being alone.
Boulevard is different - the narrator accepts his life the way it is, he's used to it, no matter how horrible it might get or seem, this loneliness is his way. Only sometimes does he dream of someone finding him and saving him from his aloneness, but so far he doesn't know any better and is patiently waiting for a change.
That should get you started.