OCD

I have a stack of postcards ready to be written on and sent out, but I don't have any postcard stamps. I realize that I might be slightly OCD when it comes to postcards.
1. I can't write on a postcard if it doesn't have a stamp on it.
2. I can't use a regular first-class stamp. It has to be a postcard stamp.
3. I never put postcards in my home mailbox with the flag up...I always take it to a Post Office, or a blue mailbox.
4. I almost never put it in a box if the mail has already been picked up.

OCD doesn't explain this type of organization though...