Why is my bum not getting bigger?

I’m a 14 year old girl and I’m insecure about the size of my bum. I’m petite (5’0 or 5’1) and my body is slim ( not skinny and not fat) I have been trying to naturally get a big bum for about 6 or 7 months now by doing basic squats, ever since I’ve not seen any results. I even try to eat foods like dried apricots, beans, milk, nuts, yogurt, berries that have fibres and protein yet still it hasn’t really been working. Everyday I try my hardest to repeat these things and I’m getting tired of it, of not seeing the results I want. Sometimes I feel like my bum got bigger then I feel like it shrunk. I’m not gonna give up, but I’m very tired of having a small bum. Please can someone please me why I’m not seeing results or if so any other exercise or food suggestions? Thanks.