Tactical possibilities are there in every game. Often they are much simpler than in tactics trainer puzzles. Two examples of simple one-move tactics that you missed from one of your games.
So, pay attention to discovered checks, pins, king and queen on the same open diagonal or file etc.
As to doing many tactics puzzles, I'm not sure if that helps that much. You seem to be doing them very fast - faster than the average times which are already quite fast - and getting a lot of them wrong.
Feeling very depressed about chess. I simply am not getting any better. I do countless puzzles and reading, but in games I do not see any chance to use learned tactics. Ever. I've tried playing slower games (i use another website usually) but still. Zero progress whatsoever since I started 6 months ago. Please Please Please, I want to like chess but right now I absolutely hate it. WHAT AM I DOING WRONG!?