Wrong Niyat for Sunnah Salaah

The Niyah I had been saying since childhood for sunnah salah felt wrong. Translated it was, “I intend to pray 2 rakat namaz sunnah for Rasul Allah (continues)…” That bit about my salah being “for” RasulAllah bothered me because of a self-realization that what I really meant (praying to Allah) was different from what I way saying.I corrected myself and did tauba.
In my mind, for sunnah I am praying “to” Allah ofcourse but “for” the Prophet intending to mean as an act of obedience to him because sunnah was his way. Was my thinking incorrect? As far as I remember, Kufar & Shirk was not intended. I know shirk is something I wouldn’t ever do knowingly but I am now paranoid & uncertain about my intentions prior to my realization. I continue to think thoughts regarding this which I am not sure I believed in before.
Was this shirk? am I a kafir apostate because of this even though it was unintentional and by mistake? Do I have to repeat my Nikah? If yes do I re-register it with government ?