what is this feeling?

you feel sad though there's nothing to be sad about
you feel alone, but family and friends surround you

you feel so distant
and yet you are just here

maybe it is the feeling of emptiness
the feeling of longing for something
but you do not know exactly what it is...

or maybe you are just tired,
exhausted from the troubles of life
or maybe its just me...
but i really don't know...

maybe you can tell...