I can relate a lot to this. Maybe a part of this is also due to the language we are already familiar with. I'm not sure if the difficulty of your language would affect this, but I feel like learning a new programming language is difficult because we are very comfortable with the one which we already know.

I mostly use JavaScript for various purposes. While moving to other languages, we expect certain things to be present naturally and be as easy as they were in your previous language.

Several strong reasons, as you mentioned too, occasionally encourage me to learn a new language, but after a few days of frustration, I end up coming to JS. Maybe this is how JS/Python has spoilt me with the flexibility they provide, or maybe I am utterly lazy.

One solution to this which I can think of is building a mini project related to something the new language you are learning was originally made for. For example, if you are planning to learn Rust, try a small CLI, or some low-level project instead of directly building a web server. I'm not sure if I'm correct though.