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No, they probably aren't stupid.
If you mess up, you can fix it. The backspace key is there for a reason.
You also don't have to show anybody, and remember that no one here will ridicule you.
You should also consider making forum games out of your ideas, if you haven't already. If I have an idea that I
really like, then I just make a game out of it. I don't really do any formal planning; you do, and that's more than I've ever done.
Start doing it spontaneously, before you get a chance to think your counterproductive thoughts.
Though forum games may not be the best if you want to avoid
Lyeos craziness.
The thing is successful people don't care that their ideas are stupid.
Mate: Flappy Bird. 50 Shades of Grey.
No matter how stupid it is, someone will buy it. Basically minimize the number of outstanding projects, prioritize them by size and how worthwhile they are. You're not going to make much money off a "Let's Play" video series for example, and they can take a long time. That's the sort of thing I'd put way down on the back burner.
Short stories are a great use of time though, get those written, there's a lot you can do with the format. Work in chunks, a novel is really a series of short stories after all, break it down and set small goal. You can smoosh all the stories together later on computer nowadays, so it really doesn't matter what order you write chapters.
Yeah, I would start with short stories/drawing. You could also make some to use for your lore and worldbuilding.
Clear out the easy ideas, and build up to the big projects.
I probably didn't have to tell you any of this though; you can think for yourself and probably already have plans to do all that.
Also, if you don't mind, can you give us some examples of your ideas/plans? And when you say game do you mean video game or forum game?