I think you've learned more then you think... For example: there's like 110 000 words in dutch, if I remember correctly. Who cares if you don't know some of the weird words. Heck, I think even I dont use over 5 percent of them frequently, and Id be suprised if I actually knew 50 percent of them. Once you are familiar with the most commonly used ones, you get along quite well. At least, good enough to pick up the meaning of the stuff you don't know yet.