One of many flaws

I've had Christmas cards, HANDMADE no less, done since November. They are all put together, and as of Tuesday are now all signed. I've got my list of who they go to. I know where/how to find the addresses I am missing. I've got stamps. And yet, there they sit. Still at home. Unmailed. I do this all the time!! What is wrong with me!?!?!?!