Why do we/I fear the unknown?

Why is change so scary?
Nothing in life is predictable.
Anything can change at any single second.
The fear, most often to me, feels like wasted energy...I fear changes everyday, but do not understand why.
Change can be so good.
It can cleanse your soul.

I have been "purging" my closets and drawers (donating and throwing away) I wasn't scared to toss old shirts and shoes.
Which in the past, friends literally have had to sit me down to throw things away.
The proportions of my fear is so astounding, if I don't understand it, how can I change it??
Only certain changes? On what scales?

I'll just leave it to my professional for now! (That would be why I'm paying her, right??)

I need to clear the haze, and move forward one step at a time...