Je suis une quiche, ou une tarte
I'm a dork.
In the announcements, Duo announced a Fowl Language generator, where you can get five French insults & cheers useful for soccer games. That helped me discover the self-deprecating expression in the first paragraph.
One of those cheers, I figured it had to be a song:
There's other languages too, but Je n'étudie que le français.