Lol!!! Aw. What is it about German that you're finding difficult? I took German two years ago, I can probably help a lil. The key to languages is practice, so maybe you can practice on my wall, and we'll converse in basic German for a bit.
I agree about motivation. Once I loose it, it's hard for me to get it back, and that could be detrimental to my studies, as I always need to be motivated.
The MBTI theory surely doesn't take into account the fluidity of the human psyche and personality. It can be rigid sometimes. It helped me understand a few things about myself tho, but I am starting to move past it slowly.
Are there any other personality theories out there that you find interesting?