True, having unrealistic expectations of quick progress can be detrimental. It doesn't mean that you can't make fast progress (many people have), but it's important to be patient, focus on doing the right things for your progress, and enjoy the process.
Improvement Threads
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Most threads these days are made by frustrated beginners with unreasonable expectations. Chess is hard. It’s not a video game that you can master plying 24/7 for a week. You must build a foundation, learn many things, and in most case invest several years (usually far more) before you reach strong Club level. Most people never get that far. Only a few become masters.
The best things you can do if you care about improvement are learning tactics and studying the games of nineteenth century masters: Adolf Anderssen, Paul Morphy, William Steinitz. Then a few who span the nineteenth and twentieth like Emanuel Lasker, Harry Pillsbury, Mikhail Chigorin.