Done: I participated in a course where they asked us to dress in costume and sing along to a song. I picked "shake it off", got on stage in front of like 200 strangers, and started lip-syncing. The MC stopped the music, told me to sing louder, and be outrageous. Yikes. I don't remember much after that- but I sang solo in public. 

WHY: I sang at a religious event and a work function. Both times I was on stage, as part of a group. But when it came to my solo, I deliberately sang less/ worse than I could- downplaying myself from the fear of criticism. I'm not a singer (and don't aspire to be) but I don't want to let fear and shame muffle my voice.