Is it a good idea to write my college essay on how a dance show I presented in my sophomore year of High school helped me/inspired me/ get rid of my social anxiety/timidness changing my lives in many ways including grade, social life and also helped me change the life of many?
I think it is interesting. Focus on being upbeat.
It could work, but try to bring it to life by being descriptive. Show, rather than just tell. If an AO can visualize what you write, they will be more interested in your story.