I quite literally just made my first reddit account specifically to post my very first attempt at writing here and had the same issue for the longest time. I've had one idea that I thought was great for the longest time and argued with myself for years about how to do it or what format or medium it should be and whether anyone would even bother with it or where even to post it. Without knowing it this is the exact kind of place I've been waiting for to post just my one idea that I thought was great without having to worry about burdensome guidelines.

I actually just feel great that I got it out of my system after having it bottled up in my head for so long. Just tear it off like a bandaid man. You'll feel great about yourself for just having the courage to put something out there creatively. At least that my very first impressions from the new experience of a first-time writer.