it's my first tab, but i think these are the right chords.
 
Em:022033
C :032033
G :320033
D :000233
  no capo
 Em/C/G/D (keep playing these chords during all song)

If I were a boy
Even just for a day                 
I?d roll out of bed in the morning 
And throw on what I wanted and go 
Drink beer with the guys 
And chase after girls 
I?d kick it with who I wanted 
And I?d never get confronted for it 
Because they?d stick up for me 
           
Chorus:           
If I were a boy 
I think that I?d understand 
how it feels to love a girl 
I swear I?d be a better man 
I?d listen to her 
cause I know how it hurts 
when you lose the one you wanted 
cause he?s taken you for granted
and everything you had got destroyed! 

 
verse 2:

If I were a boy 
I would turn off my phone 
Tell everyone that its broken 
so they think 
that I was sleeping alone 
I?d put myself first 
and make the rules as I go 
cause I know that she?ll be faithful 
waiting for me to come home ( to come home) 

Chorus
If I were a boy 
I think that I could understand 
how it feels to love a girl 
I swear I?d be a better man 
I?d listen to her 
Cause I know how it hurts 
when you loose the one you wanted 
cause he?s taken you for granted 
and everything you had got destroyed! 


It?s a little too late for you to come back 
Say its just a mistake 
Think I forgive you like that 
If you thought I would wait for you 
You thought wrong 

Chorus
But your just a boy 
You don?t understand (and you don?t understand) 
How it feels to love a girl 
Someday you?ll wish you were a better man 
You don?t listen to her 
You don?t care how it hurts 
Until you lose the one you wanted 
Cause you taken her for granted 
And everything that you had got destroyed 
But your just a boy?