I don't really get imposter syndrome with my art or such, but I do get it with my game development/coding. Because of anti-RPG Maker elitism and because I don't use big names like Unity, I don't feel like a Real Coder.
But sometimes I wonder if I would have less hassle if I wasn't constantly fighting against bullcrap design in its editor. (Though honestly it's just the map editor that's my current hellscape, everything else I can work around.)
@Taylor Toolbox software (RPG Maker, Twine, etc.) is a gateway drug for game development. Toolboxes are fantastic within their domain and then you want to do something it’s not designed for and it can’t help you and you get frustrated at it and want to learn something more versatile; eventually, the last “something” is “general-purpose computer programming”. No shame in using it until it seems like less trouble to learn the next skill than to keep fighting against the tool limitations.