https://skyrim.nexusmods.com/mods/33051//?
I really like this mod. It basically allows the player to choose whether they are Dragonborn or not. If they say yes, nothing changes. However, if they say no, then the main quest is adjusted slightly. The MQ becomes only playable up until the first dragon attack near Whiterun, after which the player becomes thane of Whiterun, and the dragons start appearing. However, you can no longer absorb dragon souls, all dialogue referring to you as Dragonborn is unspoken, and the MQ ends after you become thane of Whiterun.