I was reading "Resilient" by Rick Hanson. It is not an anxiety book but there was one of the chapters that  Hanson mentions about being calm. There was one part where Hanson tells you to be aware of the things that protect you. It helps me feel calmer, a little bit more confident, and I catastrophize  75% less. It was really helpful and I wanted to share. Here is the exercise:

“FEELING SAFER NOW

Take some breaths, and relax. Be mindful of any tension, uneasiness, or worry. Step back from any anxiety and observe it. Let it be, and let it come and go.
Let fear in any form move to the background of awareness. In the foreground, bring to mind things that protect you. Be aware of the solidity of the floor beneath your feet, the stability of a chair, the sheltering of a roof over your head. Be aware of your clothing, shoes, and other things that protect you. As you recognize these protections, open to feeling increasingly protected. Be aware of things around you that are protective, such as stop signs and hospitals. Keep opening to feeling protected. Allow a sense of protection and safety to sink in, becoming a part of you.
Recognize some of the many resources in your life that could help you be safe, such as people who wish you well, who would stand with you and for you. Also resources inside you, such as endurance and determination. Open to feeling that there is a lot you can draw on. Challenges will come, but you’ve got many ways to deal with them. Keep opening to feeling safer. Let needless worry fall away. Let go of any tension. Let a sense of safety sink in and spread inside you.
Notice that you are basically all right, right now. You may not have been all right in the past, and you may not be all right in the future, but in this moment you are OK, protected, and resourced. There may be pain, there may be hurt or sorrow off to the edges of your mind. But there is no mortal threat, no tiger about to pounce. You are fundamentally safe, moment after moment, breath after breath. Your heart is still beating, you are going on living, you are still all right. Let thoughts and feelings come and go. Abide with ease at the front edge of now. You are still breathing just fine, the next moment is passing through, you’re still OK, you’re safe now, safe in this moment, moment after moment, basically all right, right…now.”

Excerpt From: Rick Hanson,  Ph.D. “Resilient.” iBooks.