i dont think it is, i'm 14 my self, and my bra size is 36c, and i think anything bigger would just get in the way, that and they will get bigger as you grow.
That's on the big side, but still normal.
The band size of a 36C bra refers to the measurement around the ribcage, which is typically around 36 inches. The cup size C corresponds to having a 3-inch difference between the bust and band measurements. Therefore, the chest size for a 36C bra would be around 39 inches.
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A girl wears a bra by clipping using the clips.