“MAYBE ITS B/C I KNOW THAT ITS PROBABLY B/C I LOOK DIFFERANT THEN THEM”
I’m not certain YOU are sure why you are uncomfortable. Maybe, its because you probably look different than them. Do you look different than they do? Possibly? Probably? Maybe not? I don’t even want to guess how you might look different because it is likely that I will guess wrong. Do you feel people are saying hello to try and pry into your life and to learn about your looking different? Are you uncomfortable with that difference? or the perceived insicerity of the hello?
Whatever the case may be, most people who come over and say hello do so because they simply want to say hello to someone new and make them feel welcome. If you prefer to be left alone, as has been suggested by someone else, slink into the back of the shul, sit in a seat right near the door and run out as soon as davening is over to assure as little contact as possible with everyone else.
My suggestion though, is to allow the kindness of people to positively affect you.