I have this same problem. My wife always tell me I look scary – and being a six-foot-tall, 275lb., Italian guy does not help. We’ve determined it’s because I am constantly checking people out; seeing what they’re up to; what’s their angle! Unfortunately, I always assume everyone I meet has an agenda and I, subconciously treat them as such. I’m aware of it and try to be more open to people. Once you get to know me though, I’m a teddy bear.