Being skinny without having to do anything?

So im 22 and im 165 hight and i weigh 52 kg. I eat whatever i want and i dont gain weight, i have small breasts im A cup.
I eat a lot but i mostly eat in small portions, but i do go to the bathroom often. I dont have problems with my stomach, and im usually active, i work a lot i go to school, out with friends, im always up and going. I dont go on any birth control pills and never had and never will.
but i barely excersize, i go running at times but not often

So is this what its called to be "naturally skinny" ? will i gain more weight in the future?
Being skinny without having to do anything?
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