Stuck Unwillingly in Middle School

It's not fair. My grade seems to be split in two. There are the people who have given up Middle School thinking and have moved on to High School, like me, and a few of my friends. But, then some others including one of my closest friends, and it's not fair, becuase she is all like "Oh, this year sucks. I want to go back to 8th grade. I loved 8th grade." And I hate that. 8th grade sucks for me. I love her, but she needs to grow up a little