Is crying childish?

Hi girls, a few moths ago I started doing gymnastics, I really love it but it's hard for me, I'm pretty bad at that. Today they asked us to do a presentation infront of the people who has been training a lot of time and I felt really scared and really bad because I know I didn't do what I was supposed to. So I felt so frustrated and embarrassed and I started crying and my boyfriend (he was there) told me that I was being really childish, that crying was not going to help and that realky made me feel worse. I am also scared that people in the class do not like me because I'm not good at that and because they may think that I don't take that seriously. What do you think?

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