I have to write a 3 page essay on an analysis of a song. I get that a theater is being used as a metaphor for life in this song. Can any one help me out with the meaning? I like to take things line by line. THANKS!

Living on a lighted stage
Approaches the unreal
For those who think and feel
In touch with some reality
Beyond the gilded cage

Cast in this unlikely role
Ill-equipped to act
With insufficient tact
One must put up barriers
To keep oneself intact

[Chorus:]
Living in the limelight
The universal dream
For those who wish to seem
Those who wish to be
Must put aside the alienation
Get on with the fascination
The real relation
The underlying theme

Living in a fish eye lens
Caught in the camera eye
I have no heart to lie
I can't pretend a stranger
Is a long-awaited friend

All the world's indeed a stage
And we are merely players
Performers and portrayers
Each another's audience
Outside the gilded cage

[Chorus]