According to Osho, your causeless guilt is conditioning from “good” parents and priests who condemned joy and glorified misery; their voices now echo inside you, so happiness triggers shame. Guilt is pathology, not conscience. Drop it—disidentify from parental/priestly voices, unlearn no-centered conditioning, and reclaim celebration as virtue. A truly religious life is cheerful, not solemn; let joy guide you, not inherited prohibitions.
You feel guilty for no reason because you were taught that being happy is wrong—ignore those old voices and allow yourself to enjoy life.