What is a self?

There is no self, only a sence of self. Only 5 animals posses a sense of self. All others are like 2 year old humans.

I also suggest this topic, a truly unique experiment for a buddhist forum: An unique experiment - First time on a buddhist forum

As Buddha said, when people are questioned about why they believe there is a self, they all fall back to 1 single argument, that of a specific feeling that appears from time to time.