Heyo--
Beautiful song, so I scraped together some chords.  Whole thing is pretty much repeated 
riffs in the key of C, centered around E, but these chords sound pretty good strummed.
--Southpaw13

I Am Yours
Churchill
Change EP

Intro: Am(7 counts) G(1) C(2) G(1) Am(5) 2x

    Am
I'm tired of fighting you so I'll say what you want me to
    C                G         Am
You know we're gonna wake up tomorrow
      Am
We're back to where we began, to start it over again
    C                G            Am
Our voices break and steal and borrow
    C                                          C  G    Am
You hold your tongue, your words are locked up in your lungs
        Am
So I'll come at it quietly, I just want some honesty
         C                 G            Am
Well you know that I can't ease your sorrow

         Am
But I am yours, yours, yours
       C                         G C
If you love me, make your mind up, make your mind up
     Am
I am yours, yours, yours
       C                         G C
If you love me, make your mind up, make your mind up, oh

Am(7) G(1) C(2) G(1) Am(5)

     Am
So I leave with an open hand, your grip pulls me back again
      C             G         Am
We're all together, lost in nowhere
    Am
You say what you mean to babe, tomorrow's a different way
    C                     G           Am
The story's changed, what reasons are there
            C                                      C    G Am
And now you hold your tongue, you're trying not to come undone
          C                    C                    G         
  Am
But all I need is won, so baby speak your words and take me somewhere

            Am
‘Cause I am yours, yours, yours
       C                         G C
If you love me, make your mind up, make your mind up
     Am
I am yours, yours, yours
       C                         G C
If you love me, make your mind up, make your mind up, oh

Am                                                 C
You wanted me to let you, you wanted me to let you in and I tried, I tried
Am                                                 C
You wanted me to let you, you wanted me to let you in and I tried
                C
But there ain't no way else to tell you that

     Am
I am yours, yours, yours
       C                         G C
If you love me, make your mind up, make your mind up
     Am
I am yours, yours, yours, yours
       C                         G C                 
G                    Am
If you love me, make your mind up, come on make your mind up, 'cause I am yours

来源：www.ultimate-guitar.com