My Frown's Gone a-Missing

I smile at home to keep the peace
I smile at work to keep up pretenses
Somewhere in these crowds
My frown's gone a-missing.

I don't want to smile
I just want to frown
I only want to scream
And let it all out.

I want to be by myself
I want to be me
The constant smiles are giving me a headache
I just want to be.

And yet, day in and day out
All I do is smile
Instead of looking for my frown
Which seems to have gone underground.

Oh somewhere in these crowds
I've lost something, someone special

Can you please help me find me?