Sort:  

Fear is in fact a real response however maybe it should be called "uncertainty of the unknown". The brain demanding more information. It is a safety mechanism. A natural survival instinct. The key is to learn more about what is in front of you. All we can do is experience life for what it is and learn to cope with our own doubt. Mindset.

At its core it is illusion. But that doesn't mean it isn't real in a variety of ways.

Yes.