I try to remind myself that they may not actually thinking that, I just might be perceiving it that way. Or what you see might be concern, but since they're strangers they don't want to step out of line and ask if you're ok. But I usually try to just keep my head down and keep walking.

I just have to keep telling myself that as soon as I walk away they'll forget who I am. They don't know anything about me, even if they ARE judging. It doesn't really make going out any easier sometimes, because no matter how many times I tell myself something that doesn't mean I'll believe it.