According to Osho, the inner journey begins when worldly striving collapses: defeat in ambitions and lust, the failure of craving, and a deep wound that reveals the futility of outer life. Only when desires turn sterile and excitement for the external drops does attention naturally turn within. Otherwise, spirituality is just a tactic to succeed in the world, a shopkeeping extension.
You start looking inside only after you truly feel that chasing wins and pleasures outside no longer works.