I've loved this song since I was tiny, so here you go :) pretty sure it sounds accurate...haha! The strumming
pattern that I use in the verse is down-down-up-down, with just down-up-down on the F at the end, sort of like
the rhythm of the twiddly bit. You can use it if you want :)

C       C           Am               F
One two three four, tell me that you love me more
C         C            Am               F
Sleepless long nights, that was what my youth was for

C      C           Am            F
Old teenage hopes arrive at your door
C             C           Am    F
Left you with nothing but they want some more

G   F
Ohh oh oh
       Am
You're changing your heart
G   F
Ohh oh oh
    Am
You know who you are

C            C             Am               F
Sweet heart, bitter heart, now I can't tell you apart
C        C     Am              F
Cosy and cold, put the horse before the cart

C        C               Am             F
Those teenage hopes with tears in their eyes
C             C         Am         F
Too scared to own up to one little lie

G   F
Ohh oh oh
       Am
You're changing your heart
G   F
Ohh oh oh
    Am
You know who you are

C       C           Am       F
One two three four, five six nine and ten
C           C       Am                 F       C          C   Am   F   C   C   Am   F
Money can't buy you back the love that you had the-e-en
C        C           Am        F
One two, three four, five six, nine and ten
C           C       Am                 F       C          C   Am   F   C   C   Am   F
Money can't buy you back the love that you had the-e-en

G   F
Ohh oh oh
       Am
You're changing your heart
G   F
Ohh oh oh
    Am
You know who you are
G   F
Ohh oh oh
       Am
You're changing your heart
G   F
Ohh oh oh
    Am                 C    C   Am   F
You know who you aaa-a-are
        C      C    Am   F
Who you aaa-a-a-a-a-are
   C    C   Am   F
Woohoo

(carry on the chords for the verse until you're ready to end, then end on a C)