How do i get over this fear?

At tryouts my coach decided to make me a flyer. I am very small and light so she said i was perfect. I am okay at doing sponges i just need some more upper body strength, but when we started to do first floor i FREAKED out! I really want to be a flyer but for now i am terrified. Anybody ever have this problem? By the way i am going into 10th grade, and have never done cheer before, i did gymnastics for 3 years though. PLEASE HELP ME! HOW DO I GET OVER THE FEAR?