I’m curious about what others might think about the concerns I’ve had while developing on my own.

I’m not working for a company yet, and I’m developing alone. When developing by myself, there are times when I lose confidence in my code. As I write code, I sometimes wonder if this is the right way to do it. After pondering for a while, I take a break and then start again, only to repeat the same concerns.
I find it difficult to separate concerns, decide which design patterns to use, and understand when and how to apply them. Even after searching for solutions, it’s hard to apply them. Are there many people who, like me, worry a lot about their code but struggle with applying design patterns?

In my situation, would it be better to finish the project I’m working on first, no matter what, and then refactor it later, rather than worrying about the issues mentioned above?

I want to become a more skilled developer. What should I focus on or do a bit more to take a step forward?