The human brain undergoes substantial development throughout our lives, particularly from birth through adolescence.Our brains are shaped substantially by the context in which they develop. They need all kinds of stimulation and social support to develop optimally.
The mind is an interesting, and complicated, machine. All behavior is a reflection of brain function. YOU, your joys/sorrows, memories, ambitions, sense of personal identity/free will, are no more than the electrical activity of a vast assembly of nerve cells.