How human became human?

Through evolution.
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Human has evolved from the same ancestors as all the other primates of today, meaning apes and monkeys. Human has not evolved from monkeys, but the same paleo-primates as them. Humans and monkeys ways separated some millions years ago. In the line of the human there have been many other species besides the Homo, which developed to modern human. Some of the species were: Australopithecus Afarensis, Australopithecus Africanus, Paranthropus Aethiopicus, Paranthropus Boisei, Paranthropus Robustus, Homo Habilis (used tools), Homo Ergaster, Homo Erectus (walked on two legs), Homo Heidelbergensis, Homo Neanderthalensis (Neanderthal human) and Homo Sapiens (modern human).
All the other species except Homo Sapiens are dead by now, or in the case of Neanderthals, mixed with modern human. All the non-african people still today have some Neanderthal genes in them. The next relative of the human today is bonobo chimpanzee, smaller version of regular chimpanzee, living in Kongo. The other large primates are gorilla and orangutang. Even human and chimpanzee have 98 percent same genes they are still gone far away from each other during millions of years.
Often there is speak about a "missing link" between humans and apes, but the whole idea of missing link has been wrong from the very start. There is no holes to be filled with missing links in human family tree. It is proven perfectly that humans developed from paleo-primates like the apes aswell.