Attending a "Foreign Language" Class

Recently I realized that learning foreign languages by myself just does not work. No matter how many words and grammatical rules I memorize, I still can not master them without speaking which makes me feel discouraged and bored with learning. So I spent about 4,000 RMB to attend a "Foreign Language" class for 3 years. During that time, I'll be allowed to learn 5 different languages including German, Japanese, French, Korean, and Spanish. It's a good deal, isn't it? I'll attempt to learn all 5 languages as soon as possible. So fun!

Nicely done. I've never seen "crestfallen" outside a book so I changed it to "discouraged". Other than that, there were very minor punctuation and verb tense issues. 加油！