This is my first tab. I don't know if it's 100% accurate, but sounds good to me & 
this is the way I play it. And it's easier than the 1st version. :).

~~ Let ring/ring once.

Strum Pattern: 

Intro & ending: ddd.
Verses, chorus & bridge: dddu

(I play verses that way cause I'm just starting and I can't sing and play it DDD 
at the same time, but sounds better if you play DDD).

Standard tuning, capo on 2nd fret.


Chords used:

Bm- x24432
D-  xx0232
A-  002220
G-  320033

Intro:
Bm, G, D, A~~
Bm, G, D, A


Verse 1:

       Bm  G
Here I am. 
               D                 A
Feels like the walls are closing in.
       Bm  G             D              A   
Once again, it's time to face it and be strong.
  Bm           G                  D               A
I wanna do the right thing now, I know it's up to me somehow. 
     Bm   G  D   A
I've lost my way.

Chorus:

           Bm                  D
If I could take it all back, I would now. 
  A                      G
I never meant to let you all down. 
Bm             D
  And now I've got to try 
A             G
   to turn it all around...
    Bm                D
And figure out how to fix this. 
  A                     G
I know there's a way so I promise 
Bm                       D           A
  I'm gonna clean up the mess I made. 
           G       Bm    D
Maybe it's not too late. 
A            G        Bm   D   A
   Maybe it's not too late...


Verse 2:

               Bm     G
So I'll take a stand, 
     D                 A
even though it's complicated. 
      Bm  G
If I can
        D                A
I wanna change the way I made it. 
     Bm           G                  D               A
I've gotta do the right thing now, I know it's up to me somehow. 
     Bm   G  D   A
I'll find my way.


Chorus:

           Bm                  D
If I could take it all back, I would now. 
  A                      G
I never meant to let you all down. 
Bm             D
  And now I've got to try 
A             G
   to turn it all around...
    Bm                D
And figure out how to fix this. 
  A                     G
I know there's a way so I promise 
Bm                       D           A
  I'm gonna clean up the mess I made. 
           G       Bm    D
Maybe it's not too late. 


Bridge:
 
  A                G                  Bm                D   
I'm gonna find the strenght to be the one that holds it all together. 
  A                    G           Bm                         D        A~~ 
I'll show you that I'm sorry but I know that we could make it better.


Chorus:
           Bm~~              D~~    
If I could take it all back, I would now
  A~~                    G~~
I never meant to let you all down
Bm~~            D~~       A~~         G~~         
   And now I've got to try to turn it all around
    Bm                D
And figure out how to fix this
  A                      G
I know there's a way so I promise
Bm                      D            A
 I'm gonna clean up the mess I made
G                 Bm  D
Maybe It's not to late


  A                      G
I never meant to let you all down
Bm         D         A           G
  Now I've got to try to turn it all around
    Bm                D
And figure out how to fix this
  A                      G
I know there's a way so I promise
Bm                       D
 I'm gonna clean up this mess I made
A           G      Bm    D
 Maybe It's not to late 
A           G      Bm  D A G Bm D A G~~ 
 Maybe it's not to late.