Why should i write?

And why do you write? I ask because i write short stories and world build as a way to bond with my wife. We really enjoy coming up with characters. I also love role playing games, writing individual characters and have dozens ive made over the years. I find myself enjoying the stories for these characters in my head or day dreaming but i SELDOM write them down or share them with people. Some of my friends have really enjoyed them and encouraged me to write them down. My wife encourages me to but i cant for the life of me convince myself why i should. I dont think anyone else would honestly appreciate my stories or characters and of i "write for myself" then i may as well journal or day dream.

So in a round about way im seeking encouragent from other authors about why i should write down or share my stories. Thanks in advance!