I am in a similar situation myself, for the past several years.
I can't eat with my parents at the table without getting anxious, and watching or even listening my father eat makes want to jump out of my skin.
I've gotten accustomed to the feelings over time however and they don't bother me as much as i do not live with my parents anymore except when i'm in town.
Do you have any idea as to why you are so self-conscious about this now ?
I know i have really bad memories from childhood at the ''table'' from arguments down to harrasement, situations that continue to this very day, dinner or lunch was always that -powder keg ready to blow at any moment- time, but as i said with time i've gotten accustomed to it.