Baby Trilingual

English is my first full language. In high school I took French, and I'm taking it again now. But over the summer, i went to Deutschland and learned German. 

I am terrified to open my mouth in French class because German might come out. 

Today was the first day of classes and my instructor wrote un dictionnaire on the board. She asked us to describe it. 

My mind: "oh that's easy. Es ist eine Wörterbuch." I was thinking, in English, "a dictionary is a word book" and since dictionary in German is literally word-book, my mind went to German before French. 

This is a real problem. *sigh*