You will change your voice during adolescence, which is an important part of your normal development. You can't change back to your voice. Although not as childish as before, you will still have a sweet voice. Everyone will grow up, children's voices will flow away with the years, and men's masculinity will gradually grow. As long as you pay attention to your voice at ordinary times, you don't have to worry. When I grow up, I will like singing more, and it will be more meaningful.