What is something you do for yourself to get over social anxiety?

When I am by myself, I feel free of judgement and very confident. In these moments I feel as though I have managed to get over any social anxiety and bouts of self consciousness. Though as soon as I am put into a situation with another person, or many people, my insecurity comes rushing back. This happens even when I am alone with my boyfriend whom I do trust and love very much. Therefore I ask you Reddit, what is something you do for yourself that helps you get over your social anxiety?