I'm asymmetric, too. Everyone does. Don't worry too much, but if it's obvious, it may be caused by your bad habits.

For example, when you are sitting, you often cover your face with one hand, or you always sleep in one position, or you always eat with one tooth. You are still young. If you pay attention, you will change back. But even if it is not obvious, we should pay attention to the bad habits I mentioned above, because those habits will lead to obvious facial asymmetry if they are persisted for a long time.