Join thousands of others who have signed up for the Daily Record newsletter.A Dumbarton vocal coach is hoping to smash the stigma around performance anxiety after being the headline speaker at a conference on the topic.Petra Borzynski, who runs Singing Sense in Dumbarton, said helping others with the stresses of performing has been a passion of hers since she experienced her own issues as a young singer.And after being the keynote speaker at the British Voice Association’s Healthy Mind Healthy