I've actually never played it, but my cousin has and I really like watching lol.
One of my theories is that you are actually William Afton (if that's his name) and the reason you get so little power is because the owners are trying to get you killed by the animatronics. I haven't "studied" any icebergs because they tend to get creepy, so tell me if anything is wrong with this theory.

You can post all of your theories on fnaf here.