A penny for MY thoughts?

Excerpt from Carrie Underwood's So Small

It's so easy to get lost inside
A problem that seems so big, at the time
It's like a river that's so wide
It swallows you whole

While you're sittin round thinking about what you can't change
And worryin' about all the wrong things
Time's flying by, moving so fast
You better make it count, cause you can't get it back...