Didn't find any accurate one so just sat down and figured out the chords...
In the orginal key and  a half step down (easier to play).

Standard tuning:
Verse + Chorus: F# G#m D#m B
Bridge: B D#m C# B D#m C# B D#m C# G#m

or tuned half step down (Eb Ab Db Gb Bb Eb):
Verse + Chorus: G Am Em C
Bridge: C Em D C Em D C Em D Am

Verse 1:
                F#If (244322@1)I were a boy
G#m (133111@4)                   D#m (xx4342@1)  B (x2444x@1)    Even just for a day
     F#I'd (244322@1)roll outta bed in the morning
      G#m (133111@4)                     D#m (xx4342@1)BAnd (x2444x@1)throw on what I wanted and go
                        F#Drink (244322@1)beer with the guys
G#m (133111@4)                  D#m (xx4342@1)  B (x2444x@1)   And chase after girls
     F#I'd (244322@1)kick it with who I wanted
         G#m (133111@4)                    D#mAnd (xx4342@1)I'd never get confronted for it
               BCause (x2444x@1)they'd stick up for me

Chorus:

             F#If (244322@1)I were a boy
G#m (133111@4)                       D#m (xx4342@1)B (x2444x@1)   I think I could understand
         F#How (244322@1)it feels to love a girl
       G#m (133111@4)              D#m (xx4342@1)BI (x2444x@1)swear I'd be a better man
               F#I'd (244322@1)listen to her
G#m (133111@4)                      D#m (xx4342@1)B (x2444x@1)   Cause I know how it hurts
          F#When (244322@1)you lose the one you wanted
            G#mCause (133111@4)he's taken you for granted
      D#m (xx4342@1)                       BAnd (x2444x@1)everything you had got destroyed

Verse 2:
If I were a boy
I would turn off my phone
Tell everyone it's broken
So they'd think that I was sleepin' alone
I'd put myself first
And make the rules as I go
Cause I know that she'd be faithful
Waitin' for me to come home (to come home)

Chorus:
If I were a boy
I think 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 lose the one you wanted
Cause he's taken you for granted
And everything you had got destroyed

Bridge:
B (x2444x@1)                  D#m (xx4342@1)     C# (x43121@1)          B (x2444x@1) It's a little too late for you to come back
                  D#mSay (xx4342@1)it's just a mistake
           C# (x43121@1)                BThink (x2444x@1)I'd forgive you like that
                D#m (xx4342@1)            C#mIf (x13321@4)you thought I would wait for you
         G#mYou (133111@4)thought wrong

Verse 3:
But you're just a boy
You don't understand
Yeah you don't understand
How it feels to love a girl someday
You 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've taken her for granted
And everything you have got destroyed
But you're just a boy

Hope you like it