I can't help it but I like to work in Imperial! That's what I was brought up on and I still use it.
I can't even grasp weight in metric. All I know is I weigh around 12 stone, but kilograms has me lost.
It took us ages as kids to learn to convert to Celcius from Farenheit, and Pounds shillings and pence to $ and cents. It was a confusing time in history as a young'en, to have to change over after just spending all your school years learning one way, then have to throw it all out!
But I am prepared to give or take an inch