A strange thing happens when you study something for years and years, accepting (repeatedly) that you're just not very good at it and allowing (repeatedly) that you may never understand why you keep doing it anyway.
You get better. Maybe not fast, maybe not when you expect to, but in time, eventually.
I've been videoing myself dancing, weekly, with the same partner to the same music for a few months now. I've been studying the videos, and to my surprise the woman I'm watching is looking more and more like a dancer.
I'm guessing you're thinking one of three things: "well, duh", or "how can you be sure?", or even "who cares?" If it's the last, go read my Awesome post. (Right now. You'll love it.)
If it's "how can you be sure?" I answer: it's about smoothness, and musicality. Posture. But it's also something that's hard to define but you know when you see it. Grace. Something I never thought I'd see in myself.
And if it's "well, duh"? To you I made a cute piss-off gesture that you find amusing, feisty and adorable all at once, and you resolve to bring me some fabulously tasty chocolates next time you come to watch me dance.