It's natural. Nothing is wrong with that. It's simply a transition phase. Everyone goes through it. Your body is trying to mature and step into adulthood.
When I was a young boy, I used to love playing hide and seek with my parents at the supermarket. But when I started being a teenager, the supermarket was simply a place to grab stuff, pay for it and go. My parents tried to encourage me, but it was a flat no.
I also used to be fascinated by the items in the supermarket. There were just so much things to buy. Every time, I would try out a new type of candy, buy a new toy...etc... But then teenage years came, and all I bought were snacks, drinks, deodorant and stuff on the grocery list. I wasn't at all interested.
The point is, don't worry. You are a perfectly normal girl. Just let the transition flow by like a river...