Look at the old arcade games from late 1970s. Pong the original, Space Race, Breakout, Blockade (now called “Snake”), Tank, Space Invaders, Asteroids. These games took 3+ months for one person back in the day, some took several people. That's three months by people who knew what they were doing using the best tools of their era.
We have amazing tools and engine ecosystems, people who know what they're doing can copy those games in days, people who are more skilled learning can copy them in a few weeks.
Catomax26 said:
I'm horribly stressed by how much TIME, EFFORT AND PRACTICE it takes to make a shitty excercise project, and something as dumb as a 2D game that doesn't even have a goal or anything, i mean a simple practice project.
Some of the projects you're comparing against in your post are products that took YEARS for a single developer, or most of a year for two or three people.
Seconding the advice from others, you'll need to adjust your expectations of what a person can do.
A very useful task there is to just build whatever you can build in a one month time-box with the focus of learning your rate. Make a goal of pong in a month, see how far along you can get. Make a goal of Breakout in a month, see how far along you can get. Make a goal of Snake in a month, see how far you can get. You'll learn a lot about prioritizing work, the scale of what you can do, learn about your discipline levels in getting work done, and much more. For many beginners accomplishing any of those in a part-time month is a difficult challenge.