I cant believe i'm the first person to put anything useful up for this song. :P
slap a capo on the fifth fret. i watched a video of them performing it. they do 
finger picking. if i have the time, ill post a tab. All chords relative to capo.

  C | Cadd9 |Am | Em |  G  |  G/f | G/e
 
-0---0----0---0---3---3---3-----------------------------------------------|
-1---3----1---0---0---0---0-----------------------------------------------|
-0---0----2---0---0---0---0-----------------------------------------------|
-2---2----2---2---0---0---0-----------------------------------------------|
-3---3----0---2---2---2---2-----------------------------------------------|
-x---x----x---0---3---1---0-----------------------------------------------|


INTRO:

C     Cadd9     Am     Em     (play 2x)

VERSE ONE:

C     Cadd9     Am     Em     G      Cadd9
C     Cadd9     Am     Em     G      Cadd9 (let ring)

im two cups into my coffee break
sitting alone in the cafe frontway
reading all by myself
turning my cell off just to breathe 
because everyone i know just keeps calling me
and i 

  (no chord)
just need a little time 

CHORUS:

C     Em     (alternate between these two chords at the beginning and end 
                  of every line of chorus)

because im overcommiting myself
i guess this is growing up
im sleeping so little these days
i guess this is growing up
im feeling things about to change
i guess this is growing up 
yeah
im growing up

BRIDGE:

C     Em     C

dooooo doo dooo doo dooo doo
ooh oh oh yeah

VERSE TWO:

Cadd9     Em     Am     Cadd9     C     Cadd9     Am     C     
Em     G

and my mom hates my guts
she has a reason to
mith all the things i do
and it breaks me just to know
that i have torn her apart
so many times so many times
and 

CHORUS

EXIT:

C     Cadd9     Am     Em     G

and now im done with my coffee break
turn on my phone 
now that ive grown up

G     G/f     G/e     C (strum once backwards and let ring)


hope you like it! please rate. :)