Nothing embarrassing, our ancient books clearly mentions what defines an Indian culture and what constituted ancient India(Bharatavarsha) mentioned in our ancient books and folklore. As I mentioned everything East of Indus from Gandhara in North-West to Dravida in South India is our culture and thus by Bengali, Punjabi, Telugu, Kannada, Malayali, Tamil all shares a common culture and common historical identity.
Your Pakistan identity was invented in Ch. Rahmat Ali in 1930 and that's the main reason you lack Indian kind of deeper/historical meaning and understanding of your Pakistani identity and when some Sindhu or Pashtun feel proud of his culture, you see that as a danger to idea of Pakistan .