Every game I spend getting winning positions and then getting flagged. Like, literally, every single game, thats what happens. Either that or I win all of my opponents pieces and then i blunder my queen because I have 2 seconds left.
This game mode is utterly stupid -- I've played over 1000 blitz games and still cannot get the hang of it. Everybody who enjoys playing blitz, I don't know how
In my personal experience, I struggled with blitz quite a bit when I actually took blitz seriously, and similar to you, it was due to time troubles even though I was 1800-1900 bullet at the time. Analysing your recent games, I think I see the problem. You spend way too much time in what I think aren't very critical positions, and you play way too slowly when you're winning. My advice is that when you are in like a non-critical position, try to spend less time and when you are in an winning position, you shouldn't really think at all, maybe playing at half the speed of bullet. Even looking at the most recent game, you really can't be spending 10 seconds in a non-critical in a winning position with 1 minute left.
Point
Rather period or full stop