Thinking in German

Now I've been here for almost a month and my German is getting really good. So good in fact, that I think in German as I'm speaking it. I can also think in English as I'm reading or speaking it. So, when I'm reading an English book and Antje asks me something, an odd mix of German and English comes out while my mind switches to German. For example, "Ja Antje. I'll gehe to the Bäckerei in five minuten." The weirdest is, I can't say this sentence unless I've been forced to quickly switch languages.