My little sister

My little sister really just text me that she got the boy she likes phone number.................why am I sad? My baby sister is not a baby anymore. She will be 13 this year (INSANE) . It was just yesterday when I was dressing her up and taking her to show all my friends how cute she was. Now she likes boys..........................yuck. Why would she want to go and grow up? I guess she didn't get the memo, that I would like her to stay a little girl for a while longer.