It is completely normal to understand more (passive) than you can produce (active). You need to directly practice speaking and writing - hopefully you get some chances to do that in class, also see if there are some drills or something in your textbook (or ask your teacher to give you some extra exercises).
Keep at it. Language learning rewards steady practice, and things that seem difficult now will become second-nature with time. The worst possible thing you can do is take a break, so try to keep up with some regular revision over the holidays, too.