Beginner diving help!!?

Well I just started diving practices last week and i need help! i have basics down and my coach is trying to help me do a front pike dive. i know its so simple but im so scared! i tryed once at a practice but i flopped and i cant get myself to do it again! I know i can do it and i want to i just need help! My coach kept on trying to get me to do it again but no matter what she says or does i cant do it!!!!