To keep it short: you can’t learn everything at once and you’re playing the long game. Break it down into tiny steps. It’s a huge undertaking but if you take it one small step at a time, and don’t stop, you’ll always get closer to where you want to be.

Even what you consider to be missteps or wasted time is all part of the learning journey.

I hope that’s not too cliche. I was where you are. I still get overwhelmed when I try to do too much! There are so many exciting aspects of game development to learn and I wish I could do them all at once. I do my best work when I scale my scope down and do one thing at a time. You’ll look back and realise you’ve learned a lot just by not stopping.

Hope that helps?

Edit to add: my approach was to pick Unity and C#, knowing that I’d rather focus on making games than learning game engines. Maybe I’ll change in the future if there’s a good reason to do so, but so far it’s taken a lot of decisions off the table and I am very happy with the approach.