Nervous from guitar exams

Helloooo

I have guitar lessons once a week for last 5 years and I really enjoy playing it, but as always, there are gonna be exams and a concert. And i am nervous af. I mean, Last years I get asked why am I playing vibrato. I was just so nervous that my hand shaked and it sounded like a vibrato. And the concert today. Even thou other kids cannot play any better than me, we all feel the same about our playing abbilities, its just so uncomfortable to sit there and play fir all the parents, teachers and people I have never seen in my life