People stare at me and mimic me?

At my job, on the train and the street people try to walk like me and talk like me, it's pretty annoying. I have asperger's and some of my friends tell me i make faces like I'm mad, sometimes sad or tired, I don't know how to change this and due to my condition, I have weak muscles, I like to work but It's very challenging for me but I don't want the syndrome to become an excuse, I get things done even though I end up drained and people can tell, I'm not on medication or anything. I want to know how to change this, not make faces and have more energy. People seem to notice something about me I guess, at work, some people stared at me at the cafeteria and stuff like that and mimic me, same thing on the hallways and such. Any help?