What drives away all joy according to the school boy?

According to the schoolboy in William Blake's poem "The Schoolboy," the rigid constraints of formal education and the oppressive nature of the classroom drive away all joy. He expresses that the natural inclination for play and exploration is stifled by the demands of learning, which disconnects him from the joy of childhood. The lack of freedom and joy in the pursuit of knowledge ultimately leads to a sense of despair and dissatisfaction in his life.