I was in your position for a long time. For me, the problem with writing was/is that it's very slow, and you get very little positive feedback, so it's hard to stay motivated, hard to keep going. You write and you write and you write some more. Is it good? Is it bad? Who knows! Eventually, if you end up publishing your story, you might get some praise from your readers, but it's not a lot, and much delayed, which is much too late to your lizard brain.
What finally got me out of that rut was AI-assisted writing. Every time you write something, the AI writes something back. Sometimes it's awful, usually it's prettty good, and rarely it's much better than what you had planned and you end up rolling with it. It's the contant play of question (your own text) and response (the AI's) that kept me going through those early days... and weeks... and months until I could finally keep a story going on my own. Yeah, it took me a while.
Anyway, if you want to give it a try, this is what I used:
https://play.aidungeon.io/main/newGame. There are also others that I haven't tried personally, like NovelAI or HoloAI.