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

C5  G5 Dsusp7  E5  E5   C5    D5
--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 E5 after it go..

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

And when you play E5 , go..
--3--3--------- | 
--3--3--------- | 
--0--2--------- | 
--2--0--------- | 
--2--2--------- | 
--------------- | 


Intro: C5 - G5 - Dsusp7 - C5 - G5 - E5 x2

Verse:

C5         G5   Dsusp7
This is the first time I've ever felt so alone

C5      G5        Dsusp7      E5
When you said you'd stay, I believed you 'till the end

C5     G5      Dsups7
I'm sorry if the way I act is inconsistant 

C5        G5     Dsusp7       E5
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.

E5             D5            C5
If I could go back on the promises I made

E5     D5 * 
Then this life wouldnt be the same

E5           D5      C5    
This heavy burden I have in my heart

E5               D5
Would be lifted away

Verse 2:

C5           G5  Dsusp7
You're not the same girl that I fell inlove with

C5    G5         Dsups7  E5
I don't know what happened but you changed

C5      G5       Dsusp7
I'm gunna show the world that I can live without you

C5      G5       Dsusp7     E5
I'm gunna show the world how strong I've become

*Chorus*

Verse 3:

C5            G5     Dsusp7 
You turned your back so take your first step, walk away now

C5   G5          Dsusp7       E5
When I look back at you, I can finally move on

C5        G5      Dsusp7
You said I wasn't mature? Well at least I'm honest

C5         G5       Dsups7           E5
Now that you know who I am , how do you feel about yourself?

*Chorus*

Bridge: X2

During the D5 , 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- | 
-------------- | 
-------------- | 

G5          C5             E5
If I could go back, I'd change one thing


            D5
It's how I put my trust in you


Bridge 2: *play intro* then..

C5      G5       Dsusp7
I'm wanna show the world that I can live without you

C5    G5       Dsups7  E5
I wanna show the world

C5      G5       Dsusp7     E5
I'm gunna show the world how strong I've become

C5      G5      Dsusp7   E5
I'm gunna show the world


Repeat First Verse, and end :)