Strive to master the language throughout your mission and after you return. The Lord has invested much in you, and He may have uses for your language abilities later in your life.
As your ability to speak the language grows, people will listen more to what you say than to how you say it. You will be less worried about how to communicate the feelings that are in your heart. You will be better able to respond to the needs of those you teach and the promptings of the Spirit.