I think i have an amazing idea until i try putting it into pitch form (I will not promote)

I've always had trouble converting ideas in my head into actual words. In my mind, everything feels obvious. I can picture the product, the problem it solves, and why people would want it. But the moment I have to explain it to someone else, especially in a pitch format, it suddenly sounds much less convincing than it did five minutes ago. Pitch competitions and evaluator sessions have always made me nervous for that reason. Having to condense an idea into a few minutes and communicate it clearly feels a lo