Chords used in this song. 
They change up a little bit, but I'll make note of how to play them. 

C9  G Dsusp7  Em7  Em   C    D
--3----3----3----3----0----0----2---- | 
--3----3----3----3----0----1----3---- | 
--0----0----2----0----0----0----2---- | 
--2----0----0----2----2----2--------- | 
--3----2---------2----2----3--------- | 
--0----3---------0----0-------------- | 

Everytime you play a Dsusp7 without an Em7 after it go..

----------------- | 
--2--4--2--0----- | 
----------------- | 
----------------- | 
----------------- | 
----------------- | 

And when you play Em7 , go..
--3--3--------- | 
--3--3--------- | 
--0--2--------- | 
--2--0--------- | 
--2--2--------- | 
--------------- | 


Intro: C9 - G - Dsusp7 - C9 - G - Em7 x2

Verse:

C9         G   Dsusp7
This is the first time I've ever felt so alone

C9      G        Dsusp7      Em7
When you said you'd stay, I believed you 'till the end

C9     G      Dsups7
I'm sorry if the way I act is inconsistant 

C9        G     Dsusp7       Em7
With what I say and how I feel about you

Chorus:

When theres a D*, slide your fingers to the forth fret and back on the 6th and 5th 
string with all other strings open. 
Only strum the top three strings.

Em             D            C9
If I could go back on the promises I made

Em     D * 
Then this life wouldnt be the same

Em           D      C9    
This heavy burden I have in my heart

Em               D
Would be lifted away

Verse 2:

C9           G  Dsusp7
You're not the same girl that I fell inlove with

C9    G         Dsups7  Em7
I don't know what happened but you changed

C9      G       Dsusp7
I'm gunna show the world that I can live without you

C9      G       Dsusp7     Em7
I'm gunna show the world how strong I've become

*Chorus*

Verse 3:

C9            G     Dsusp7 
You turned your back so take your first step, walk away now

C9   G          Dsusp7       Em7
When I look back at you, I can finally move on

C9        G      Dsusp7
You said I wasn't mature? Well at least I'm honest

C9         G       Dsups7           Em7
Now that you know who I am , how do you feel about yourself?

*Chorus*

Bridge: X2

During the D , play it like this:

3-0-3-2-3-0-3- | 
2-2-2-2-2-2-2- | 
3-3-3-3-3-3-3- | 
0-0-0-0-0-0-0- | 
-------------- | 
-------------- | 

G          C             Em
If I could go back, I'd change one thing


            D
It's how I put my trust in you


Bridge 2: *play intro* then..

C9      G       Dsusp7
I'm wanna show the world that I can live without you

C9    G       Dsups7  Em7
I wanna show the world

C9      G       Dsusp7     Em7
I'm gunna show the world how strong I've become

C9      G      Dsusp7   Em7
I'm gunna show the world


Repeat First Verse, and end :)