Body parts? 20 years old

Is it strange that i am 20 and i don't even know where the hole where my pee comes out of , or the hole where my period comes out ? I shave and look down there but never really realize ? I kind of feel stupid because i don't know. I guess i can say i don't even know where I'd put my fingers if i was to masterbate. I guess I'm nervous to find out ?