How do I get a girlfriend?

First a little sketch of myself. I'm 15, learning on a school where there are only 20 girls and i am the creep of the class because i want to join the army (in Belgium is the army not so respected and is laughed after.) when i finish school and i'm into higher sciences and my friends say that i am dangerous because I do martial arts. Now, i need a girl in my life to bring me reason and balance. what should I do?