Possible new opportunity

There’s an audition for something I really want to do like my dream job. But I’m nervous I don’t want to have so much hope and then it get crushed but if I pass this could start a life for me that I’ve been dreaming of since I was a child. The thing is sooooooo many other girls like literally possibly hundreds of thousands of other girls are auditioning too. Some will have professional training and practice and dedicate most of their time to this craft. Should I do it? And if I don’t pass how would I go about not being literally depressed. I can’t help but compare myself because all the practice I have is literally just being in my room. When there’s people who practice like 4 hrs everyday. i know I should just try anyways but not passing would crush me