Have You Ever Stop Thinking?

I always feel that I never stop thinking about anything. Various thoughts always spinning in my head, good and bad thoughts as well. It happens agan and again, I'm thinking and thinking again. Usually, they're about future, desicions, plans, or just random things. How can I stop this? CAN I stop this? I mean, stop thinking randomly.

Then I found out that it's just human nature to think and over-think things. --a