is that my illusion

Maybe yes,maybe no.
Anyway,there are still many mysteries in the world.
We cannot explain them mow ,for the technology is not that high.
But remember one thing; do not be afraid .Just think about the people long ago,they spent their time innocently.

absolutely yes

有时候在一个安静的地方，我会听到一些奇怪的声音，但是其他的人说没有听见，是我的幻觉吗？（错觉吗？）

Maybe

don't take it too hard