@OldDude hey, young man, stick with it. Not all bad. Regardless, you still learned some things this game. Coastal starts can be a bit more challenging and slower, but it is something you still need to learn, especially for other types of maps.
I think you are still bitten by some of your old habits. Going back to our first discussions, you really need to eliminate them and try to focus on the advice given. Continually asking yourself does this move or that make sense based on what I have learned.
For instance, the thought to go IW just because you see a few jungle tiles around. The key important thing here is that you work around the jungle for the time being - the early game. IW is an expensive early tech that does not do much for you. Something like Alpha allows you to trade for IW later, while being a tech that leads to other good things and trades. Much more bang for you buck. On higher levels you just cannot get away with bad tech decisions.
So back to the jungle. What you do here is work with what you have. For example, the copper city that has jungle bananas. Don't worry about the nanners for now. You are relying on the strong copper tile and maybe a couple of grass farms early for some growth. It's all relative to the timing of the game. Early on, that copper tile is a strong yield that suffices for production. Yeah, it is not food as we so harp on, and you likely will not whip much here, but you will leverage that good tile early. (One day copper city will be able to grow quite large - likely a good HE candidate city if applicable - but it is what it is right now and more than productive)
Elsewhere, you have a good food cap, and a couple of decent cities.
I think, one, that the focus on GLH was probably confusing. That is my fault. GLH is a very powerful wonder on certain maps, but generally not something one considers for Pangaea. The difference here is that you actually have some islands nearby to settle. The idea being that you use the islands for the extra commerce, which is boosted more by GLH. Any city on a separate land mass, including an island, increases trade route commerce substantially.
But still, talking about GLH probably diverted you quite a bit from the important basic things you need to learn. On high levels though, with this start and island, GLH might be a power play.
Also, I think losing the cow spot was a bit disappointing for you, and again, if I did not press GLH you may have easily gotten it.
As for economy, your's is more than fine right now. Still something for you to learn and be cognizant of moving forward. And technically you had spots other than Kyoto, ofc, for commerce cities later.
Lastly, I want to emphasize the whip mechanics again. I had linked a primer in one of your earlier shadow games, and I will link it again here. I encourage you to read through the links for a better understanding of whip mechanics and overflow.
https://forums.civfanatics.com/threads/going-from-noble-tooo.468987/#post-11671673
What I recommend is reading through it and starting a separate practice game to practice the concepts when you have time. Just a game for practice.
Anyway, you can restart this game, or fire up another one...but keep on learning. This will all sink in eventually. We've all been where you are now. You are making progress - just need to iron out some of the bad habits.