In terms of age, you should learn to be mature and learn to take responsibility.
About removing the mustache: Because you are still young and in the stage of growth and development, it is normal for your beard to grow. It is best not to shave it. The more you shave, the thicker it will be and let it grow naturally. If it is really long, If it affects your personal image, your parents will also tell you what to do, so don't be too hasty. Every male compatriot has been through this, so when it's time to shave, you will naturally choose when.
If you insist, it is best to go to a qualified beauty salon to shave. Of course, your parents must accompany you.
The other side of the east is in the desert