Do you ever write your own backstory?

Pretty self-explanatory, I guess. I’m running a D&D 5e campaign, so I’m playing BG3 basically blind on the side to get my own D&D fix. I was just thinking of writing a basic backstory for my character, but I felt like maybe that’s kinda weird? I wanted to know if any y’all do it, too.

Also, please don’t spoil the game; you probably won’t, y’all are cool.