There are two major qualities of humans that make them different:
1. Humans at large are neither telepathic nor psychic.
2. The life span on earth is short.
Many of our qualities stem from those two.
One of the most interesting features on Earth is diversity. It stems from the first two qualities. Due to the lack of telepathy, there is little unification. Every individual, every group, village, town and country are different and unique. Since we communicate only by voice and gestures, until recent times, the distance of communication was very short. In recent years electronic technologies provided us with long-distance communications and thus we start to unify a bit more, but there is still huge diversity.
Also, due to the shortness of life, we learn little, but our evolution produces again, much of diversity. We have a huge variety of races, languages, dialects and cultures on our planet.
The humans at large don't know yet; but you may know that the human genome although based on Earth predecessor, has both ancient and recent infusions of many alien races.
These include the Annunaki, Pleiadians, Lemurians, Lyrans, Sirians and possibly Greys and Reptilians. Different human races vary in proportions of DNA of different alien races. Even within each race, there are groups speaking different dialects, and treating others as outsiders.
In this respect, the Earth may be looked at as a miniature model of the outer world. The history of galactic wars and expansions has imprinted on our people.
We reproduce well. Currently, our population is near 7 billion.