I'm not afraid to make you laugh. How to say it in English?

I hope it doesn't make me look so funny. After I transferred to the language class, I couldn't catch up with others in German. Last German exam, I came last. The teacher asked me why my paper was empty, and I said I couldn't even write a word. Then I couldn't help crying. My classmates are laughing at me because I cried over such a trivial matter. However, I feel very ashamed. Even what you taught me before has disappeared in my memory. I know it's inconvenient to bother you again. You are always busy. To tell you the truth, I hate Germans. I am old, and my tongue is no longer flexible, at least not flexible enough for tongue rolling. Every German class I take is a setback for me.