I think my family know me better than did some King Cnut I had the displeasure of working 'with'.
But in a hundred years or more all of the existing members of your family will be dead. So unless you or other relativeS maintained detailed diaries, your descendants will know very little about you.
One of my great grandfathers was killed in WW1, A grandfather and his son were killed in WW11, My father was a commando and fought in Malaya in WW11 and is now long dead. I know all of the dates, but with the exception of a few fading photographs, I know nothing about their experiences. Written records would be very precious to me.