Alright, very quickly; I'll explain why you (the audience, not anyone in particular) can't win. In order:
1. You don't learn from your mistakes. If you make a mistake, owe up to it. Nobody cares if you lose, but people do care when you make excuses."But I did everything right." No you didn't; otherwise you wouldn't have lost. And you will lose again if you don't find out what was wrong.
2. You gloss over turns, mashing "end turn" At the end of the day, this is a strategy game, and mashing end turn to get to stuff being finished is not the best way to play. Try to plan ahead and think about what to do next instead of plowing through. Do not suddenly play 100 turns all at once and be like "What do I do now?"
3 You are passive. You don't pay attention to the world around you. Now, we all know the notifications system is horrid and hard to keep up with, but when you fail to notice your City States are getting swallowed up or your nearby neighbor is becoming a huge menace, you will pay for it. The AI is dumb. If you get surprised by the AI, then you' just aren't paying attention. Be proactive in chasing victories.
4. You ignore military. Related to the above. Please stop it with the "I'm not going for a domination victory, I don't need to build any defense whatsoever." War is a part of the game, embrace it. If you won't, your neighbor probably will.
5. You build things at random. You should have a good idea of what to prioritize first. Wonders are expensive and carry a huge opportunity cost.
6. You don't play to your civ's strengths. This should be pretty clear; you can't just do the same thing every time.
7. You overplay your civ's abilities. On the other hand, playing as Scythia doesn't mean you have to build nothing but horsemen-- their civ abilities apply to all kinds of units. Sometimes horses are not a good idea.
8. You ignore the map. Some maps have lots of food and low production, other maps are faster, some maps are slower. Don't take this all for granted.
9. You speculate. Should you settle a spot that has 2 iron deposits when you have no iron elsewhere and good production, or this spot with no production but has a spot for a +6 campus? Don't even consider the later. Pipe dreams don't win games.
10. You don't use cards effectively. As it turns out, +50% increase in production is a big deal. Always swap out cards to the ones that are relevant to what you are doing and focus.