Why do people cough or scratch at me?

This has been going on for too long, and it's made me completely paranoid. I consider myself a good looking person, and get compliments often. I dress well, don't smell, don't wear strong colognes, but I've noticed something that has truly changed the way that I view people completely. Whenever I am around people, there's always someone that always coughs in my direction. And it's almost never the they're sick kind of cold. It's almost like they want to say something to me, but refuse to use words to do so. I could be at a restaurant, and as a person pes my table to be seated, they cough. Whoever, I'm sitting by, if they manage to not cough while I'm there, the second I stand up to leave, there's the major cough. At work, whenever I get on the phone random people close by start to cough as if trying to tell me to shut up. I could be entering a store, and p by someone, and as I do, they have to cough in an I-have-to-scratch-my-throat-because-you'… This truly hurts my feelings whenever it happens, and sometimes, I get so irritated that I cough right back at them. It's with all kinds of people (young, old, black, white, hispanic). It truly doesn't matter. It's almost like the world has a vendetta against me, and I can't for the life of me figure out why. I am soft spoken, well mannered, courteous. Most times, these people haven't even heard me speak. As soon as I'm present, as quiet as I could be, the throat clearing and the coughing begins. I've tested it with people that I work with, and kept an ear on whether they cough when they don't know I'm around, like I may sit far from them, in a place, where I wouldn't normally, but close enough to where I would be able to hear the coughs, and nothing ever happens, but as soon as they realize I'm back, there they are coughing again. If it were just one or two people that I've experienced this from, I would seriously ask, but it happens in all kinds of social gatherings to me, and I can't ask everyone why they do that to me, or if they have a problem with me, which is truly what I believe. I consider myself a really good person, and used to have faith in people, but I haven't now in at least a couple of years. It's hard to care about people or have faith in them when you feel mistreated by them, and what kills me is that I can't comprehend why. It's almost as if someone put a hex on me, or as if I was hypnotized and told that my feelings would be hurt and that I would be made feel disliked by others everytime they coughed. They scratch at me a lot as well. Typically, it is a combination of both, but when it's not one it's the other. Mostly, it is the coughing. God forbid I cough back at someone, then I'm almost always immediately asked, God, are you ok? Like what, I'm not allowed to cough, but everyone else is? Can someone tell me why this hurts so much, and why people do this to other people?