These are the acoustic chords to the song. The chord spellings I give are the way 
I have seen them played live. The chord positions above the words are not exact, I 
didn't want to spend forever trying to line them up.
Look at this video: http://www.youtube.com/watch?v=yrDRitQVbpU He plays it the 
same expect he is playing it tuned a half step down and capo-ed.
Enjoy!

Standard Tuning                           Chords Relative to Capo:
Capo on 3rd Fret                          Em7 = 022033    D = xx0232
                                        Cadd9 = x32033    G = 320033
                                           Am = x02210


Intro:
Em7 D Cadd9
Em7 D G

Verse 1
Em7                 D                Cadd9
How does it feel on your half of the world
Em7                    D                     G
If you?d ask they?d say nothing?s changed on mine       

Pre-Chorus
Cadd9
Just because I tell a joke or two
G
and believe I?ve got the whole world fooled
Em7                              D              Cadd9
Done a damn good job to hide the hurt behind the lies.

Chorus
Cadd9                 G D   Cadd9           G  D
I didn?t even tell my mama, or even my best friend.
Cadd9                  G    D  Cadd9
How you walked out and took my pride.
        Em7                      D       Cadd9
I?ve been livin? on the outside, dyin? on the inside
        Em7                      D       G
I?ve been livin? on the outside, dyin? on the inside.

Em7 D Cadd9 
Em7 D G

Verse 2   
  Em7              D           Cadd9
I won?t pass up a single Friday night,
      Em7               D                G
and I wear this smile and pray that they don?t ask

Pre-chorus
Cadd9
Why they never seem to see 
        G
what was once the other half of me.
       Em7                D              Cadd9
I just hold my breath and hide behind this mask.

Chorus
Cadd9                 G D   Cadd9           G  D
I didn?t even tell my mama, or even my best friend.
Cadd9                  G    D    Cadd9
How you walked out and Lord I've tried.
        Em7                      D       Cadd9
I?ve been livin? on the outside, dyin? on the inside
        Em7                      D       G
I?ve been livin? on the outside, dyin? on the inside.

Bridge
Cadd9                     Em7
Walls if I just tear down these walls
               Cadd9
and admit it was over, 
                Am   D
maybe it would be over.

Chorus
Cadd9                G D   Cadd9        G  D
Then I could tell my mama, even my best friend.
Cadd9                  G    D  Cadd9
How you walked out and took my pride.
        Em7                      D       Cadd9
I?ve been livin? on the outside, dyin? on the inside
        Em7                      D       G
I?ve been livin? on the outside, dyin? on the inside.
        Em7                      D       Cadd9
I?ve been livin? on the outside, dyin? on the inside
            Em7                    D        G
I'm through livin? on the outside, dyin? on the inside.

Outro 
Em7 D Cadd9
Em7 D G
Em7 D Cadd9
Em7 D G
Em7 D Cadd9
Em7 D G