[Verse 1]
Are you gonna curse?
Are you gonna cry?
Are you gonna air your dirty laundry
On a Saturday night?

Are you gonna call your friends, sing karaoke?
Gonna sit at home all sad and lonely?
Lookin' like hell, 'cause your mascara's runnin', yeah?
Are you gonna cut your hair and dye it blonde?
Turn off your phone, turn up the song
Look in the mirror and feel like your nothing?

[Chorus]
You think you know
You think you know
You think you know who you are
In somebody's arms
But you don't know
No, you don't know
Yeah, you don't know who you are
'Til somebody breaks your heart

Ha-ha-ha-ha-heart
'Til somebody breaks your heart
Ha-ha-ha-ha-heart
[Verse 2]
Are you gonna get mad?
(Say something and overreact)
Are you gonna get even, yeah?
(Do something you want to take back)
Or are you gonna find something bigger than you to believe in?
(Lose in your heart in a love that lasts)

Are you gonna stuff your face inside a pillow?
Gonna hang your head outside a window
To feel a brand new day kissing your cheek?
It's okay if you wanna hit rock bottom
Slip up once or twice and call him
All I know is if you're anything like me

[Chorus]
You think you know
You think you know
You think you know who you are
In somebody's arms
But you don't know
No, you don't know
Yeah, you don't know who you are
'Til somebody breaks your heart

Ha-ha-ha-ha-heart
'Til somebody breaks your heart
Ha-ha-ha-ha-heart
[Bridge]
'Til somebody breaks your heart
Yeah, yeah
You can wave it like a flag
Or a scarlet letter
It can make you bitter
Or make you better

[Chorus]
You think you know
You think you know
You think you know who you are
In somebody's arms
But you don't know

No, you don't know
Yeah, you don't know who you are
'Til somebody breaks
You think you know
You think you know
You think you know who you are
In somebody's arms
But you don't know

No, you don't know
Yeah, you don't know who you are
'Til somebody breaks your heart
Ha-ha-ha-ha-heart
'Til somebody breaks your heart
Ha-ha-ha-ha-heart