WHY IS IT ALL OR NOTHING?

Why is it all or nothing?
I’m not physic
But I see knowledge of time
Not wanting to step forward
Unless I know there is bliss
I’ve lived many bleak days
Embraced the moonlight
Yet shy from sun rays
For every new moon brings
Uncertainties and unknown territory
With possibilities of failure
And now I step blind
Unknowing of what’s beneath
My foot in life