There are all kinds of things we could murmur to our brains to soothe the fear of being judged. You could point out that almost nobody is looking at you; mostly people are too wrapped up in themselves. You could point out that you already know you're competent from how you rise to occasions at work; there probably isn't much to mock about you. You can pat and soothe your brain with evidence that the thing it's afraid of is very, very unlikely.