I can't doodle but I can draw big artworks?

I understand this to an extent, I will end up just making patterns or typographic styles when I'm doodling. Maybe you could try what I call 'scribble doodles' - you close your eyes, draw a random scribble on the page, and see what you can turn it into. Mine often turn into birds or weird Little Shop of Horrors plant creatures, well usually something cartoonish and imperfect and disposable. I think the fact that you have a mess there to begin with helps to prevent you from making anything too polished.