Paizly is scared of people, too.
I live in the basement of my dad's house, and when somebody comes to the upstairs door she'll growl and go find somewhere to hide (her growl sounds like E.T.'s nervous trill/purr... it's cute!)
I went on vacation last summer, and had my sister take care of the cats. My sister was worried that Paizly was sick and/or dying! She found vomit every day (but that's not unusual for Paizly), and then got worried because she didn't SEE Paizly for the last 3 days. Thought she went off and died somewhere in a hidden corner.
Well, she WAS in a hidden corner, but alive and well - just being wimpy. I had some boxes of junk behind the couch, and a blanket over them (to make them look presentable, as my couch is in the middle of the room - not against a wall), and Paizly had decided to hide in the little 'cave' between the boxes and under the blanket.
However, if somebody visits, and they are calm and quiet... such as if we're just sitting around and having a conversation... and ignore Paizly, eventually she'll come out to investigate. Ever so often if my sister is slow about it, she can put her hand out and Paizly will sniff it, and a couple times my sister got to pet her... but then Paizly decides she doesn't like a strange person touching her, and skitters off again.