You can earn a living having a career in music if you take the time to get a diploma in music. You cannot rely on just getting noticed for your abilities. There are too many real professionals out there that know music. If you want to be able to compete with your talent and come out on top, then you need to learn as much about music and the music industry that you can early on. You cannot call yourself a musician without being able to read music. I know that sounds harsh, but the professionals can all read music. When you hear them talk, they speak using the language of music when composing songs and musical pieces. If you are interested in classical music training, it is an absolute must to learn how to both read and write music.
Teenagers often want to take a shortcut to success. They want all the pomp and money of being a music star, but they do not want to put the effort into it to really succeed. This is why such a small percentage of people who have an early interest in music actually end up making a career of it. There are plenty of people out there who are good at singing or good at playing the violin, piano or guitar. However, they may be working other jobs to pay the bills. If you really like music, then getting a diploma in music helps you establish a real career that you can enjoy doing.
There is the inevitable business side of music. If you are going to get people to buy your music, then you need to know the business side of it as well. A good music school teaches you all of this. A good music school helps you establish a working portfolio to share with potential employers too.