well if you are only afraid of going out to eat then maybe its something like "eating-phobia"
if you are afraid of approaching people or having problem to talk to other then it is anxiety disorder...
i heard there is a successful treatment for anxiety disorder, forgot what its called, something called CBT
me i have this problem too, like sitting in a place just for talking, i will feel very bad (dining too)
but if going out to play something or watching then i think still better :/
but it is going to be worst if you just keep avoiding it..