Story of my life. When I'm frustrated by this, I just remember that anyone asking me is doing so out of concern. As annoying as this trap can be for myself (and others like me), it's hard to get angry with people who are just trying to make sure you're alright. That said, I wish their intuition would tell them that I'm thinking, concentrating or working instead of assuming I'm upset or angry. Trust me. If I'm angry or upset with you, you'll be the first to know. :)