That'd be a bit lame imo.
Your character is whoever you want them to be, it's left deliberately ambiguous so you can fill in the blanks yourself with whatever backstory you want, the only origin you need in the context of the game's story is how you become a Scion which is what the first 20 or so levels are all about.
Changing this now would just be a slap in the face for people who care about that stuff, we already got some lore about all the races a while back anyway so you can read up on that and make up whatever origin you want for your character, there's even a spot on the Lodestone for you to post it!
