I am procrastinating so hard, someone tell me to get my shit together

I have been wanting and working on ideas in my head and as notes for the first book I am planning on trying to write for my fantasy world.

But man I am so terrified I guess, I just keep putting off writing it, literally weeks, I work about 40 to 45 hour weeks, and have 2 days off, 3 am usually so tired and that with the fear of actually starting to write, has made me into a procrastination monster.

I am not someone who went to college for writing and honestly the last time I wrote anything of substance was for my college writing class, and those where mostly just essays or short stories, which I might add, we're pretty aweful.

I am just so scared I'm going to start and have zero idea what I'm doing, I may have an idea and have thought of lines and scenes in my head, but just the idea of me having to figure out how to actually turn those into sentences that follow the rules of writing and actually make sense, seems so daunting.

I just, I don't know, I am scared, and I don't know what I should do, if maybe looking up information on writing or videos for beginner writers would help. I did try some and can't say they did much besides confuse and annoy me with some of their egotistical ideas they had about their own writing and how everyone should follow their style.

Please. I really just need someone to tell me what to do, I know I have horrible anxiety about failing, thats why I always procrastinated on things I want to try, I am so scared that I'll end up having zero talent or just end up wasting a bunch of time on a project that will never go anywhere, but this book and the world I have been creating is something I just don't want to give up on that easy.

If you have any words or things you did to help you please tell me, or if you have good videos on these topics or websites with helpful info, anything will help me out.

Soery for the long post. thank you if you decide to help me.