Everyone is different, that is a fact. We do also know that we all share some similarities, things that we can correlate between each other.
The things we like, the way we think, the way we see the world.
Most people have a similar alignment on these topics.
Some do not, and it’s only by chance, or comparison, that they discover this.
Think about the sight. It wasn’t until the paper (journals, etc) came to be that people realized they were short-sighted. Some could read perfectly, some could not.
Until then, nobody cared and nobody knew because they didn’t have a way to compare (or to say it better: to measure) their sight.
This is true for many things, like how you breathe from your nose, how you think, etc.
It’s not about being special, it’s about understanding that individual differences that are hardly noticeable until you start measuring it.