What we say to ourselves has a large effect on how well we do. For example,
“Don't try—do. Create goals that relate to effort and actions (which you can control), and not end results (which you can’t). Speak down: “I’ll try to do it without falling.” Speak up: “When I start to get pumped, I’ll shift more focus to my footwork and keep moving up.”
Several other tips at the link. I am positive that positive thinking can make us feel less negative. Or, maybe that’s totally wrong. I am always getting this wrong. I wish I could do better.