Hey, Welcome to DreamViews. I love binaural beats too. :0)
You're using the WILD technique. I don't know much about this but I suppose it could by a wide variety of issues: fear itself, stubbornness, doubt, or ego. Just believe in yourself. Imagine how wonderful it would be to LD. Keep praacticing and youre bound to succeed. Take a look at The Beginner's Guide to Lucid Dreaming for other help. Best of luck!