I don't if its just nerves or a confidence issue but whenever I start doing well at poker, I get nervous and anxious and then I play really badly. For example I was in a poker tournament and it's just me and another guy playing heads up. I end up folding more hands than I should and going all in at the wrong moment and then I lose. It's weird I don't feel this unless I'm getting close to the finish line. Was wondering if anyone else had this problem and how they dealt with it?