All chords should be played as bar-chords, except E and Dm. 
The transition from E to F#m goes over Fm, so it's basicaly 

    
        Abrir tablatura
        
    
    

   E E E     Fm      F#m 
e|---0---------------2-------------------------------------------------------| 
B|---0---------------2-------------------------------------------------------| 
G|---1---------------2-------------------------------------------------------| 
D|---2-----2-----3---4-------------------------------------------------------| 
A|---2---2-----3-----4-------------------------------------------------------| 
E|-0-x-0-----1-----2-2-------------------------------------------------------| 

The song switches beautifully between blues style picking and  
mostly-downwards-strumming, but it's rather easy to figure it out by listening to the song. 
And there's also a little transition from E to A after the Chorus which i can't figure  
out, but letting the E ring sounds good too. 

Intro 
A E F#m Dm B E 

A 
I'm gonna be happy 
E 
I'm gonna feel good 
F#m 
I'm gonna go skippin' 
Dm 
Through my neighboorhood 

B 
I'll be the opposite of blue 
E 
When I forget about you 

A  E 

A 
I'll be on my A game 
E 
be given high-fives 
F#m 
I'm making breakfast 
Dm 
talking about my great life 

A 
I'm living large 
E 
Yeah I'm going out 
F#m 
Not thinking how good we looked 
Dm 
like I'm doing now (you're doing now) 

B 
I'll be the opposite of blue 
E 
When I forget about you 


A               A7 
Forget about you 
D 
No I won't waste a moment 
E                                A 
thinking about what you're doing now 
A7 
Nooooo-ooow 
D 
And I won't care to wonder 
E                           A 
If it might have worked out somehow 
A7 
Hoooo-ooow 

B                               E 
And I'll give my heart to someone new 

A 
I'll see the bright side 
E 
Stand up real tall 
F#m 
If i ever get out of bed again 
Dm 
I'm gonna have a ball 

A 
And i'm gonna look so fucking good 
E 
You gonna wish, wish that you could 
F#m 
But look at me now, wondering how 
Dm 
How am I ever, gonna make it through 

B                 E 
To the other side of blue (I'm waiting) 
B                                 E 
Where I'll have such better things to do 
B                 E 
No I just cant wait to 
A 
Dorget about you 
A 
Dorget about you