Judging from your pic you are young. Dont worry when your emotions hit your life wont be the same
Why aren't I attracted to anyone?
It's perfectly normal - it just means that you're taking your time about this boyfriend / girlfriend thing. Concentrate on what you consider important now, whether it's school, a sport, a hobby.
Most romances that happen in school don't last. It is hard to see everyone around you coupled up with someone, but when the time is right, you'll meet just the right person. You'll be glad you waited instead of jumping in just because everyone else is dating. Good luck.
Because you haven't met the right person yet. You will and when you do you it will knock your socks off.
Stop worrying about this some people jump right in to the dating pool and others tread slowly, It will happen!