lets talk about what makes you tick what happens whan you are walking down the street and some one looks at you with a stair how dose that make you feel,what is your body telling you,or your mind,do not feel the fear tell us about that feeling.
I would just smile and if they don't smile back, they are probably not focussed on me at all. They are just looking at something else and I am just in the way. It very seldom is about me. People are usually just thinking about something else. I have been on the other side of this situation. I was just blanked out. When the other person smiled, it brought me back to consciousness and I just smiled back and maybe said "hi".
Others have told me that this has brought a hostile response to their smile, but that has not been my experience.