Why am I crying?

Feelings of sadness,
That won't go away,
Each and every hour,
Each and every day.
Hate worthless feelings,
That well up inside.
Dare not speak them,
I don't yet confide.
My day starts with crying,
My night ends so too.
Would somebody tell me,
What I should do.
It's happiness I seek,
But still have not found.
Just want to be free,
But feel like I'm bound.
Put on that smile,
For everyone to see,
So they will be comfortable,
Being around me.
Can't give up living,
But feel like I'm dying.
Too much to live for,
So why am I crying?