Weird me

Occured to me just now how strange I can be. I've always said I generally see the policy of telling others about what I'm doing and what I've done. Why lie or keep secrets? But then i've realised there is another side where I clam up. I offer nothing. No conversation, no ideas or thoughts. It has nothing to do with, as far as I am aware, not wanting to or trying to keep things in. I just dunno?