Do you think I have a social disorder?

That's good that you have started to become active, and have changed you're eating eating habits for the better. Unfortunately, if I were you, I wouldn't trust anyone's "diagnosis" for you, if you're receiving it on yahoo answers, or even anyone that isn't a definite licensed professional, with physical proof (i.e. diploma). The best thing to do, would be to start visiting a psychiatrist, because they are actually EDUCATED enough to give you the help you need. They would also be able to help you with your social fears, and maybe even start you in cles with people that have the same fears as you do, and you can all work together with a teacher to overcome your anxiety.