What is happening to me ? I hate girls !?

I'm in elementary school. I dont like girls they gross me out with there cooties and are so annoying ! today at school one girl touchd me and i felt something really wierd happen to the thing i pee with. i talkd to my pharents but thay sed i problaby nedeed to go pee realy bad ! i didnt want to go pee , it just got really bigger and im scared that she gave me cooties ?