I left the hair salon with a hat on

I went to the hairdresser this morning, I just told her to trim the ends and shape it a bit. She asked, 'Is 2 centimeters enough?' and I said okay. But the result? It's literally at ear level! I was in shock, but I couldn't say anything there. Now that I'm home, I can't even look in the mirror, and I'm too embarrassed to go outside. What am I going to do? Will my hair grow back this much in a month?