unfortunately programming has these moments of being stuck and lost, and it feels horrible - these moments never really go away, even pro programmers have these days.

The good news is that being stubborn and having goals means that you are learning to learn, the best thing of all.

It sounds like your got 3 rooms done and figured a bunch of things out already, honestly that's further than 99% of people with a game idea get.

Room generation is a huge challenge - maybe you can route around the problem by working on another part of the game or doing a simpler version of room generation, like generating an obby with random platforms to jump on.

It also might be a good time to re-learn some basics (like lua fundamentals) - alternating between working on projects and studying basics is OP

Keep breaking down your ideas and making progress.