I also had something similar when I was young, I remember wondering if it was normal. It seemed to lessen after I became sexually active.
Remember, discharge is the vaginas way of cleaning itself. If there's no odor and no itching or irritation then I wouldn't advise treating it with anything or you could cause yourself a problem.
Antibiotics and Antifungals (yeast treatments) upset the natural balance of bacteria in your vagina. So will douching. It could be caused by developing hormones.
Upsetting the natural balance of bacteria can cause increased discharge, odor, itching and irritation and it's hard to treat and cure also. These imbalances are known as Bacterial Vaginosis (BV) and Yeast infections. If you have a normal immune system then developing a yeast infection is rare - taking antibiotics is one of the sure ways to upset the healthy bacteria balance - antibiotic literally translated means 'against life" - it kills bacteria indiscriminately and you need many types of bacteria to have normal healthy balance.