I am 16 in 11th grade, i have the urge to pee and i go to the bathroom. Not a lot comes out so i finish up and leave, when i leave and walk away i have the urge to go again. When i sit it sorta helps the urge go away. But when i walk it is so bad i almost pee my pants. VERY URGENT. I drink 2 cups water daily and there is no blood in my pee and doesn't hurt.
sounds like maybe you could possibly have a UTI (Urinary Tract Infection).