Any ideas on how not to be scared?

ok so i am a gymnast and in Level 6. I am the best Level 5,6 and some 7 vaulter. But the problem is that I am horrified!! I have been doing good like 2/3 times i go for it. It's nothing new to me. I've been scared one time, got over it all good and then boom!! It happens again, ok good got over it. Then pow, it happens again. I just got over it for the 3rd time and im scared it's going to come back. please help me, im only 12!!! I cant handle this pressure!