TL;DR: I started at 10 because I had a good imagination, at 24 I wanted to tell a story of my struggles.
I remember I was around 10 when I started to write fictions. I think it was because I had a lot of creativity going on in my childhood and didnt have a way to put it out, I spent a lot of time playing about imaginary universes I created in my head, like literally, I'd play it irl about the stories I made, but they were based on shows I watched at the time. I dont remember what I used to write at that time, but I assume it was inspired by the shows I watched too. Around 12 I began to write some fantasy romances or something like that, with vampires and stuff. At the end of my 12s, a friend introduced me to BL, and I started a fanfiction that today is my comic xD But on my teens, I'd write a LOT about anything, some inspired by animes and books, some were fantasy, some were just romances like shoujos, I was always witing while on classes. It was a bit of an obssession to me.
Around 13~14 I had this dream of making a manga xD I did some little comics that never got anywhere, I made probably just a few pages.In the beggining of my adulthood I stoped writing and drawing because of my depression, and started drawing again in 2018, I was around 22. Eventually, I discovered webtoons, and started a new obssession. I read all the time I could, an then in the beggining of 2020 I thought to myself: why not get that old dream of making a manga and put it out there? I used to post my 2008's fanfiction, so why not do that again? I love art, I love to create stuff, and I had this story that stayed with me through my teenage years, that old fanfiction that became an original novel eventually. So... why not? A couple of months after thinking that, I started Saudade. I changed almost everything from the novel I made in my teens, I decided to talk about things I've lived, the struggles I had, and in a way how I wished some relationships had happened and the help I wished I had. So it gave more meaning to me, more energy to not drop the project as it was so close to me. And it has been my obsession since then, 3 years working on it and (almost) always with passion. And I love my boys, they're my kiddos and I'm happy I created them, even though they were a manga character before it all xD they grew and became their own characters, so I'm happy with that. There's this beautiful thing about creating little people and their stories that facinates me. Even though I am the one who write their stories, it happens in such an organic way that I almost never know where's going.
Said all that, here's my link if anyone is interested.