In the book if I stay, why does Mia hate Adam's shows?

Mia loves Adam's music, and loves him, but she hates the loud obnoxious screaming, as well as the crowds. She always stays in the back of the clubs, because they are lonely. She is very shy and not very outgoing, so she doesn't want to associate with random crazy, drunk people she doesn't know. I love this book, and if you haven't already read it, I am going to suggest the sequel, "Where she went".