I would like to become a professional soccer player and play for my country's national team (South Korea) How?

I'm now 15 years old and I'm currently studying abroad in Singapore. I have a great pion for soccer and I started playing soccer only when I was 12 years old. I have all the basics as well as many advanced skills mastered. I'm playing for my school and I'm training with my seniors. I haven't had so much of proper training. I only sharpened my skills by playing street soccer. However, the problem or more like the dilemma is that my school is a renowned school (Nus high school of mathematics and science) and it seems quite a waste to give up education. My parents want me to continue studying but they are also willing to support me if being a soccer player is the true dream of mine. So, the thing that is bugging me is that what if I fail to become a soccer player? I don't know if soccer is my true pion yet. So it might be too early to make a decision but I worry that it might be too late by the time I realise my pion. So.... I need some advice ! Thx :D