Let On

Since I was a kid
I've watched what I've said
My tongue's cut and swollen 
From all the times I've bit
I held everything in
Played dumb
I did
Now everyone's sayin'
She's so out of it
But I know much more than I let on

They talk behind my back
I don't react
The world is just a train
And I'm the tracks 
But when they least expect
l'll speak at last
They'll all turn and ask
"How did you know that?"
And I'll say, " I know much more than I let on"