Why is it so hard to say your full name

Why is it so hard to say your full name It's kind of a rent because I'm stressed about tomorrow and I thought posting might help. So my high school basketball team qualifed to the high schools league's final at my country. And my friends and I are going to watch it, my mom signed me because there's a limit of 700 students that can go watch it but I'm so stressed about the part you go to the bus and say your full name, I already missed it the last time because of the same reason and I promised myself I won't miss it again. I know it sounds pathetic like it's just saying your name but the fact that it happened in the past is already making me feel more stressed. Any tips?