We've got self-esteem

The story:

I was in the car with my mom when this song came on, and
she is not a fan of Lorde (why, I can't imagine) so naturally I
cranked up the volume and made her listen. At one point, I,
not being intimately familiar with the lyrics, asked her what she
thought this lyric was. She misheard it as "We're only
seventeen," while I tried to convince her that it was actually
"We've got self-esteem." Guess we were both wrong.