Flies

Everytime i walk home from work i get attacked by flies. They follow me home as soon as i step outside. At first i thought that it was my black shirt that was drawing them in, but i also wear a white shirt and they still attack. It always looks like they attack me more than they attack any one else. However the odd thing about it is they always land on my left shoulder. Whats wrong with my right shoulder, its just as good if not better. Why cant it be a pack of dogs or something that follow me, that would be cool.