Language Motivation

I'm currently learning Japanese and it's not easy. When I first started school I noticed a lot of improvement. But, there comes a point (I noticed the samething when I studying Spanish) when the progress seems to slow drastically. 

It's easy to talk in class when we are only focusing on one concept or chapter. However, when I try to speak in Japanese normally, I feel all these grammar concepts, and vocabulary is a lot to sort through in attempt to contruct a correct sentence. It can be frustrating. 

I think I need to review and practice more on my own. I enjoy learning the language though. Very interesting.