Hold on, hold on...

What I want to say is, I think the main reason for my anxiety and unhappiness is my almost superhuman ability to think too much. To weave even the most minuscule of moments into an elaborate tale of my downfall. I know that I'll never be truly content, until I can calm the voices in my head. So why then can't I make them stop? Books, games, fantasies, other worlds, nothing can overcome the fear that races inside. Am I then doomed to never be happy again? To hell with patience if my insides are on fire. The overly developed faculty of thinking comes at a price. How do I make it go away? Can someone tell me please? How can I use my mind so I don't lose it? How can I stop using it, when it's not needed. And when using it won't serve any purpose.