Unknown tears

No one knows that i am sad.
on one knows that i cry.
i keep it bottled up inside,
for no one to find.

i look as if i am happy.
i wear a smile on my face.
until i am alone,
then i cry.

people use me as if i am nothing.
people hurt me and pretend every things okay.

but when i am alone,
the sadness rolls down my face,
in each unknown tear.