Hi Liu Jing,
So nice to meet you here, furthermore, so nice to hear that you want to learn Zhuang Language because you are a Zhuang person.
Just keep your learning of Zhuang if that makes you very happy.
Personally, I view language as a useful tool of communication.I guess your parents could speak Zhuang pretty good, but in your case, you might grow up in a big city or a bustling town, and totally you had no way to speak Zhuang when you were in your childhood.Actually you could access this point in another way, since you have realized you belong to Zhuang Ethnic Group mentally, you could do a lot of amazing things for Zhuang except learning Zhuang Language, such as, speaking English well, mastering medical science, and so forth, and then, you could serve your high-quality service in your daily job for Zhuang people as well as for other groups.Does it make sense to you?
 
lease correct me if I am wrong.
Warmest regards to you!
David