You already have a full soprano range: C4 to F6. Coloratura is a vocal quality, not a range. Coloratura voices generally have a light quality to them, as opposed to the more powerful voice of a dramatic soprano. Coloratura'sColoraturas specialize in highly decorative passages with lots of runs, trills, and other ornaments.
So coloratura is a skill to develop if you have a lighter-sounding voice. At 15 your vocal color may still be changing, but you'll have to wait and see.
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