I think back how I managed pressure during competitions as a teen. It can be daunting to perform perfectly in front of a forum of judges. I always wore my Selix tux and patent leather shoes, the shinier the better, which gave me more confidence when I stepped on stage. I also had a big meal before a performance. I would have pasta the night before in the belief that it would give me energy the next day.
I was really not afraid, I looked forward to the challenge. Each time I entered another contest, it became less stressful and terrifying. I learned how to breathe and relax before going to greet the audience. My teachers were guides who advised me to the right repertoire selections that would give an edge with the judges. It worked.