Join a game jam.. You might not get far, but joining and trying will get you started down the road. A theme will be provided which can help get your ideas flowing, and you can use existing assets to pull stuff together along with tutorials.

For your first jam, you can even just make a physical game using cards or tokens from other sets to explore different ideas.

From there, pick a game engine and try a bunch of tutorials then pick something you want to make and use tutorials and documentation not as guides, but as references to achieve the thing you want to build.

Also, start small, like really small. Smaller than you think you need to. Pong and Snake are significantly easier than Battleship or Risk.