What do I feel?

Maybe its just the goddamn season
But I feel depressed without reason
I can't shake this feeling of gloom
Like there's an unknown impending doom
Is this an unfounded petty scare?
Or is there something dark of which I'm unaware
Possibly the cause is only chemical
Or maybe I'm crazy and cynical
Life means so little in this state
If I died today that'd be just great
But my life is good, everythings'okay
So why the fuck do I feel this way?
Its like I've fallen from lifes' fence
Existing in a place where nothing makes sense
My world used to be joyful and grand
What fucking happened I don't understand
And yet, I don't always feel like this
Even now I occasionally know bliss
Those three little words from the girl I love
They take me higher than the stars above
But times like now when all is well
Why do I feel I've died and gone to hell?
I no longer know what is even real
So what the fuck do I really feel?