If real English sounds like one long blur, you're not bad at English — your ear just hasn't been trained for connected speech. Native speakers blur, drop, and link sounds constantly, and no textbook audio prepares you for it.
Three things go quiet in fast speech: the small function words (and, of, to, for), the endings of words, and the boundaries between words. "Do you want to" becomes "d'you wanna." "Could I just" becomes "could'I just." The meaning-carrying words — coffee, station, meeting — stay clear.
So the skill isn't "understand every sound." It's "catch the big words, and stop panicking about the quiet ones." Once your ear expects the reductions, they stop tripping you up.
That's exactly what Lisenia trains: short, real-speed clips where you learn to hear the quiet words on purpose — first slowed down, then at native pace. A few minutes a day and fast English slowly stops sounding fast.