Extended metaphor

I chose to do an extended metaphor in a song. The song I chose is Firework by Katy Perry. In the first 3 lines: 

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Do you ever feel like a plastic bag
Drifting throught the wind
Wanting to start again 

She is asking if you feel alone, wandering through the streets wishing you could start over.

Do you ever feel, feel so paper thin
Like a house of cards
One blow from caving in

She's asking if you ever feel like that you have no one and you need to just curl up and cry. 

Do you ever feel already buried deep

 Six feet under scream

But no one seems to hear a thing

That like in space when you ended someone you have no one. When you scream no one can hear you. 

In the chorus she says: Cause baby you're a firework

Come on show 'em what you're worth
Make 'em go "Oh, oh, oh!"
As you shoot across the sky-y-y

Baby you're a firework
Come on let your colors burst
Make 'em go "Oh, oh, oh!"
You're gunna leave 'em fallin' down-own-own

She is saying that you are worth it, and that you are a firework. 

In the song, she explains that, you might feel alone, and that you are not worth it and that you have no one to go to, but you really do. You are worth it, you are a firework, you light up the sky, to let your colours burst. You will leave them falling down, you will leave them in awe of you. You need to show them what your worth, because you are not worth nothing, you are definitely worth something. :) 

http://m.youtube.com/watch?v=q7G15LB9d8o