No No body knows

Nobody knows it’s empty,
The smile that I wear.
The real one is left behind in the past 
Because I left it there...Nobody knows I am crying.
They won't even see my tears.
When they think I am laughing,
I wish you were here...Nobody knows it's painful.
They think that I am strong. 
They say it won't kill me, 
But I wonder if they are wrong...They think that you had let me go
When I had left you behind.Nobody knows I missed you.
They think I am all set free,
But I feel like I am bound with chains, 
Trapped in the mystery...Nobody knows I need you. 
They think I can do it on my own, 
But they don't know I am crying 
When I am all alone