Petite Girls and BMR

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Hi! I'm a female in her 20s and I'm petite.. I'm 5'0 1/2" and about 102 pounds.
The calculators I've used to determine what my macros should be all give me such low numbers! Because these numbers are so low, I use them more as a guideline than strictly following it.

I am not trying to lose a ridiculous amount of weight, but I do want to lose enough weight so that I can see muscle definition.

I know I'm at a low weight, but I feel like I look fluffy. Tips?

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