Oversharing

Three weeks after and I'm holding myself back from talking about my Mom with people, except with complete strangers.  Not sure why.  I find myself interjecting the passing of my cat and Mom (a week apart) whenever possible.  The really odd thing is it's like I'm so happy to be able to talk about it I seem unusually smiley and upbeat as I do, so which I'm wondering if people are thinking secretly that I'm cracking up.  I may subconciously realize that it's an uncomfortable subject so I overcompensate by looking and acting like a happy nut.