They say the more you supress the feelings the more you end up falling for that person, so it's a tough situation, I've been in something similar, only that I tried to like the person who liked me, I wanted to give him a chance but when the heart wants something... you just can't force it. It's not impossible of course! You are pretty young I suppose, it's not like it's the last person you'll like. Just give it time, eventually you'll get over with it, and you might even develope feelings for other person, and maybe that time, it's going to be okay to be together and it will bring you happiness :) Remember, in life there will be times when you'll fall, you just have to get up and keep going, and of course, listen to your heart, give it time. Fighting~

Aish... that's hard :(
I've never been in that situation but I wish you the best !