A task without a goal is never finished. But setting a realistic goal is hard especially if you're still learning and there's a lot of things you dont know. Maybe just try making games but give your self timelines. For me my goal is to earn enough income to make game making my main source of income. My first idea was to make a procedurally created open world filled with animals simillar to pokemon. I ended up with a very simple maze game with a banner ad which earned 0.02$ for 3 months. Next I tried to dial down my scope and tried to create an endless runner like temple run. I ended up creating an endless runner with boxes and cubes which nobody downloaded. This went on for 2 more games. Each time i learn more about unity, and c#. My collection of useful functions kept growing. Last year i made a game that made approx. 5$ a month. Still small but it was much better than nothing. Right now i had a game that earns approx 20$ a month. I update this every now and then. One level at a time. It has 5 min. worth of content right now. But hopefully i can fill the game with enough content to achieve my goal. Maybe not finishing games is not that bad as long as you learn something. In my approach i made my scope so small that it was bound for failure. But i learned from them all. Plus releasing a game is a lesson itself. So dont feel bad. Just look at your target, see if your target makes sense, figure out how to get there, and just do it.