Brain-based language congestion

I'm not a master of languages. I can just about communicate coherently in my own language and others have always been lost on me. So being in Germany is pretty tough for me. I studied German for a year at school and also a year at university. The sum total of my German knowledge is that if someone asks my age I can tell them I am 13, 14, 19 or 20 but they are obviously all incorrect. If they ask me about brothers or sisters I can tell them I have one brother (true) but his age can only be 15, 16, 21 or 22. I'm not sure why anyone would need to know my brother's age but I'm preparing for all eventualities. All pretty useless stuff.

Now the problems are coming in the sense that I know a few words in a few languages. Words like "please", "thanks", "hello", "goodbye", "does that include breakfast?", various swear words, "where is the bathroom", "can I have a beer please" (possibly the most important thing to learn in any language) and other such useful things.

When I try to execute any of these words in German I tend to end up with a random combination of French, Spanish, Portugese, Japanese and in the end just a lot of loud English.

What I need to do is to sort my small collection of words into categories and file away the currently unrequired languages until say for instance I am in Spain and I need to know if a hotel room comes with breakfast included. I need to put it into sections and just have access to the very, very few words I know in German so at least I can use them rather than staring blankly while I ponder the different options in my head for "thanks".