Every time I attend a potluck party or there's a potluck at work, I've always been told my the host(s) that there is no requirement for bringing food. So I don't. I still eat the food provided by everyone, so I still feel guilty about it.  
The reason why I never bring anything? I have trouble planning anything in advance a lot of the time, so I tend to forget to bring something.  
AITA for never bringing food to a potluck?