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I've been eating quite a lot of sugar all my life and in general I eat when I'm hungry until I'm not hungry. But my BMI is 18.5 and fat 11% (per my scale, probably inaccurate). How could this be possible? Maybe small stomach?

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Genes. It's most likely not the stomach but the hypothalamus. It basically controls hunger and some people's hypothalamus is really good at defending against weight gain, and other aren't.

My auntie could eat a lot and was always super thin. Then she turned 50 and her metabolism stopped keeping up and gained a lot of weight.

Saw the same happening with someone turning 25, super thin athletic body into gut over the course of 2 years, diet was the same for 5 years.

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