The term "culture" is very loosely used. In the end, the most culturally related nations to Azerbaijanis are still Turkic ones. I don't share your Shahnameh, and you don't share my Dede Qorqud, how can you say that its the same?
Common history and religion only since Safavids, ending with Nadir Shahs death for Azerbaijani Turks of Caucasia, from that time we had our own Khanates separate from authority of a king of Iran. Azerbaijan does not share the history of Qara-Qoyunlu or Aq-Qoyunlu with Iran, for instance.
i didnt say language, i said culture, you dont share shahname because you cant read it nowadays, while the type of stories and morals is same. That's why all great poeters like nezami or shahriar that you know them admired shahname and used it in their poets and known it as their own ancient history.
iranian kings during Safavid dynasty and government were choosing the name of their childeren from the shahname. why? because unlike you they could read it and they shard it and count it as their own culture and history.
most foods, names style, religion, behavior is same and it's called culture. about Qara-Qoyunlu or Aq-Qoyunlu you are wrong my friend, maybe personally you dont want to share it, as i mentioned above the reason why you or your government dont want it. but in history wanna me or you like it or not, it's common and it didnt belong only to safavids, you can count it since median era til qajar kings in iran.
as you talked about Qara-Qoyunlu or Aq-Qoyunlu, i refere you to read about them.
Aq Qoyunlu - Wikipedia, the free encyclopedia
just an example:
In letters from the Ottoman Sultans, when addressing the kings of Aq Qoyunlu, such titles as
Arabic: ملك الملوك الأيرانية "Iranian King of Kings",
Arabic: سلطان السلاطين الإيرانية "Iranian Sultan of Sultans",
Persian: شاهنشاه ایران خدیو عجم
Shāhanshāh-e Irān Khadiv-e Ajam "
Shahanshah of Iran and Ruler of
Persia",
Jamshid shawkat va Fereydun rāyat va Dārā derāyat "Powerful like
Jamshid, flag of
Fereydun and wise like
Darius" have been used.
[11] Uzun Hassan also held the title
Padishah-i Irān "Padishah of Iran",
[12] which was re-adopted again in the Safavid times through his
distaff grandson Ismail I, the founder of the Safavid dynasty.
doesnt need to be so bias about it,it's about the past. i'm not saying it's ours or is mine, i said we have common and it belongs to both, wanna me or you like it or not, or whatever opinion nowadays we have and it doesnt means i dont respect you or the authority of republic of azerbaijan my friend.