It does hurt when some people don't notice you and at times its actually quite frequent cause you're like standing right next to them but still no one looks to notice you and the are people you are very close with. It's a rather cheap shot that what did we do to deserve that?
But it's life we gotta get through it.
You can't bend a concrete wall you either have to jump over to cross or find a new way.
By jumping I mean that you have to do the same ignore them like they ignore you or you can simply move away and find another way to your destination.