[Verse 1: Joe Jonas]
When I look at old stuff, lookin' like it’s over
Lookin' like I'm never going to be that again
Crying over old loves even though they’re over
Never gonna stay friends, yeah, stay friends

[Chorus: Nick Jonas]
They think I'm happy
They think I'm happy when I'm sad
They think I'm happy
They think I'm happy when I'm
They think I'm happy
They think I’m happy when I’m sad
They think I'm happy
They think I’m happy when I'm

[Verse 2: Joe Jonas]
Can't look how we made it, say "Congratulations"
Lookin' like I’ll never be lonely again
See me in the mirror, nothin' ever changes
Never see the sunset, only in my head

[Chorus: Nick Jonas]
They think I'm happy
They think I'm happy when I'm sad
They think I'm happy
They think I'm happy when I'm
They think I'm happy
They think I'm happy when I'm sad
They think I'm happy
They think I'm happy when I'm
[Post-Chorus: Joe Jonas & Nick Jonas]
Never gonna stop, never gonna calm down
Never gonna stop
They think I'm happy when I'm
Never gonna stop, never gonna calm down
Never gonna stop, no
They think I'm happy when I'm

[Bridge: Nick Jonas]
I put on a smile, don't need a face-lift
Why can't I when everybody fakes it?
Well, they think I'm happy
Like they know exactly how I feel
It ain't real, but they still think

[Chorus: Nick Jonas]
They think I'm happy
They think I'm happy when I'm sad
They think I'm happy
They think I'm happy when I'm
They think I'm happy
They think I'm happy when I'm sad
They think I'm happy
They think I'm happy when I'm

[Post-Chorus: Joe Jonas & Nick Jonas]
Never gonna stop (I try), never gonna calm down
Never gonna stop
They think I'm happy when I'm
Never gonna stop, never gonna calm down
Never gonna stop, no
They think I'm happy when I'm