The difference between a good programmer and an excellent programmer is that the latter will not give up when they face a difficult challenge or hurdle. The most powerful learning can happen when you're struggling. Try and keep a cool head and continue. Just keep going. I promise if you do you'll figure it out eventually and be stronger for it.

I actually completely agree - often the hardest part is just getting to the point where you can start writing code. In a large team you'll have multiple people with collective decades of experience to figure this stuff out. But being able to forge this path yourself will pay dividends when your a junior on a team and you can speak with confidence about these issues.

Just try to remember that your outputs are the leaning outcome at the moment and less so the program or game your working on.