Tears without a reason

Have you ever felt so low, that you just wish you could disappear?
Leave this place forever and finally be at rest
But the worst part about it is when someone asks what's wrong
You can't answer, because you don't know
You don't know why you're sad
Or why you're crying yourself to sleep every night
And you constantly beat yourself up for feeling this low for no reason
You think, why do I feel like this?
I should be happy
I should be smiling and laughing along with everyone else
But instead I sit there, staring into thin air
Thoughts racing through my head
Adding to the frustration of my own self being
Everyday I go through this
And every night I'll lie on my bed and cry myself to sleep once again
Only to wake up to the same cycle the next morning