Yeah, I've always been a shit artist for I assume the opposite reason; I can think of a thing in a macro sense, like "I want to draw [thing], it has these features', but when it comes time to actually draw those features, I can't pinpoint exactly what they look like. It's like reading a few sentence description of a tree, and then trying to draw one purely based on that description - you can get a general sense for what it looks like, but not the fine detail needed to accurately represent one visually.

Incidentally, I have a difficult time commissioning art as a result, because I have an idea of what I want, but I have a hard time communicating the finer details. AI generated art has actually been really helpful for me in this regard; I can see something and know if it's what I want or not, so being able to give an AI art generator a broad description and get back 100 images from which I can pick a few and tell an artist which parts of each one I want has made it much easier.