I want to learn traditional Chinese martial arts, I'm 15 years old

I support you to learn martial arts~! Too few young people are interested in learning martial arts nowadays. Your spirit is commendable. Since ancient times, heroes come out of youths, kung fu is only good if you start from elementary school. You are now in a good time in terms of age and body, the key is too little time to practice. Also, you need to find a good teacher to teach you first.

In the long run, I don't think practicing martial arts will affect your studies, firstly because it is mainly used in your spare time, and secondly because by practicing kung fu you will improve your physical fitness and make your energy and brain power more vigorous, which will have a promoting effect on your studies and memory. But be careful not to sacrifice too much sleep.

If you really want to learn, it is recommended that you do not self-study, this is something self-study out of basically can not see what is practiced, not to mention what self-defense.

As for what to learn, first of all, you have to find a good teacher, this teacher is practicing what, you go with him to learn what, can not be wrong. If you choose the type first, it may be more difficult to find a good teacher. I advocate that you learn traditional martial arts, you can start from the external boxing, such as Shaolin boxing to start, and so on to learn a certain degree, the future a little older, to join the work, you can begin to learn the internal boxing.