What is my body trying to tell me?

Ok, im female, 12 ( yes im young, don't rub it in) and when I masturbating (I don't finger myself I cuff my hands of my vagina and shake them to make my clitoris shake which gives me an amazing feeling). Anyways when I do this for a while, I get the feeling I have to pee, weather ive had a drink recently or not... what does this mean? Sometimes I get wet when it happens, sometimes I don't, and sometimes I just get wet and not the pee feeling... but I thought that only happened when you finger yourself.. IM KIND OF CONFUSED HERE... HELP! Is it bad or good?