It seems we waste alot of our life caring about things we have no actual control over. Also I think Mark Twain said "I've spent my life worrying about things that have never happened".
I guess any kind of worrying is basically a waste of your time.
A man once told God his plans. God laughed.
I mean really. Things always end up other than we expected and worried. And the bad things that happen are usually even things we didn't worry about in the first place...