I was talking to a Sunni and he told me that we don’t have any primary sources for the seera of the prophet which makes their sources hujjah on us. Is that true?

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That’s not true. We have the holy Quran and our four major Hadith books

1. Kitab al-Kafi of Kulayni (divided into Usul al-Kafi, Furu al-Kafi and Rawdat al-Kafi)
2. Man La Yahduruhu al-Faqih of Shaikh Saduq.
3. Tahdhib al-Ahkam of Shaikh Tusi.
4. al-Istibsar of Shaikh Tusi.