I don't think that dreams in which you tell yourself "I'm dreaming" aren't lucid. You must have a reason to say that and it usually means that you found out you were dreaming. Even if it was a low level LD and you lost it, it doesn't mean it wasn't lucid. That's a really bad reason to classify a dream as a non-LD. I've remembered many dreams in which I say "I'm dreaming" and it wasn't dreaming of lucidity, it was a lucid.