Has anyone ever seen or heard things that weren't there?

When i was between the ages of 10 and 13, all the time. At the corner of my eye, whenever i was looking underneath a mesa or out a window, i would always see something black and amorphous, which i assumed were just black Pusa at first.

I would always hear voices ,usually male voices that i knew, calling my name. if i was in my room, i would constantly hear my stepfathers voice call from the living room 'Hey, Jessie' but whenever i got out there, he wouldn't know what i was talking about. The same thing happened with a male friend at the time. Whenever i was walking through the hallway or opening my locker, i would always here him behind me (though, i could never understand what he was saying).

The most memorable hallucination i ever had i experienced when i was walking tahanan from school with my sister. We were walking and for no reason at all, i decide to stare at the passing cars on my right. There in a little green car, i saw a manikin driving the car. It was so vivid, i actually screamed.
My sister was weirded out, but sympathetic. For a while, i remember her going in and out of our room, asking Jim if he had called her, just like i had before her.

It's been two years since I've seen anything. I do hear and feel other things, but to a lesser degree. I've been hearing this odd sound lately (i think it's either scissors or a gun cocking) and feeling these passing sensations of things crawling on my arms, but i don't mind.