I remember exactly when I was at this point. I had a decent grasp of Java, but I couldn't build anything that I wanted to use. The way to learn is to build something you want, or something you'd like to show off. For me it was an Android app. I knew there was Java involved, but it taught me all of the things I could never learn from just reading a book (user interactions, getting data off the network, etc). Building my first Android app and my first Ruby on Rails website showed me 'real' programming. The funny thing is it turns out that stuff is all boilerplate rarely involves the fancy algorithms you learn first, but it's what makes real products.

Since you know JavaScript, go build a mobile app with Phonegap. You'll get a really great rush when you see your first app pop up on an iPhone or an Android phone. You'll naturally want to iterate and improve, and that process will make you learn.