I'm 19 and I honestly did not really like it. I thought there were some funny and some cute parts.
But, I felt as if 13 was not the right age? I was in 7th/8th grade when I was 13. Most of the "boy band phase" was in 4th/5th grade. I was definitely not still obsessing with boy bands by the end of middle school. At the same time, when I was in 7th/8th grade if my parents said no to a concert, I might beg them but I wouldn't have raised the money behind their backs. The rebellion phase is usually a little bit more into your teens, but I think you also find yourself in the beginning of middle school or high school (or at least try to although I'm in college and I still haven't) so fighting the "inner panda" probably wouldn't have happened at the end of middle school. Also, many of my friends started menstruating in 5th grade, so even that timeline is a little late. I feel like if the characters were supposed to be younger it would have been better?
I probably will never watch it again, but it also isn't the worst movie I have ever seen.