Our brain is a very interesting mechanism! Did you know that there is a small blind dot in the middle of your eye, and your brain reconstructs this spot when the eyes move? It just remembers what was there a moment ago and shows it to us. This video by AsapSCIENCE explains this quite well.
You can't trust your own eyes because of how the brain works!
We all to some degree fear the unknown. We fear darkness not because of the color, but because we don't see what's there. And similar to that trick with the sight, our brain starts reconstructing the past experiences, which are almost always negative (you probably watched a couple of horror movies before). We just assume there is something scary that wants to eat us, although it might be just your empty room at night. We fear what we don't know about darkness.
Such assumptions are nice when you need to survive, but they are not very relevant if you are in a safe place like your home or office. However, our instincts are with us everywhere. And fear of unknown is what makes you afraid of following your passions instead of going through a well-known path that everybody else is taking. I find that very often fear is what prevents you from achieving your dreams.
Every human is a superhero. Every superhero has a superpower, and our superpower is the brain. If it makes you believe there is no blind spot, it can make you believe in anything you want, even in yourself. You are who you believe yourself to be.