Although Rand al'Thor's answer is probably right, I came up with an alternative which covers almost all clues.
a pedestrian crossing light.
I regularly wave my hands around and point at myself.
Some pedestrian crossing lights (in the US at least) use a hand as one of the symbols. The "waving" is when the light is flashing/blinking. It unfortunately doesn't point to anything (the only missing clue)...
Sometimes people stop by and look at me as if I'm trying to tell them something, and I am. I tell them all they want to know, about the only subject I know, but they can barely hear me. Sometimes they run away when they see me.
People look at the light to know if they can (safely) cross or not, and this is the only thing the light can tell anyone. When the light starts flashing, some people start running (away from the light) to cross the road. Some lights also have an audible signal to aid the visually impaired, but the sound can be soft, or drowned out by other (traffic) sounds.
I always tell them the same things every day but they never get tired of it; they always come back for more.
People will, very probably, return to the same crossing (or use other lights).