What Causes White Vaginal Discharge?

Hello, I am 20 years old, and i have been having some problems. I have been having white discharge coming out of my vaginal area. Its starting to scare me. I have been prone to getting bladder infections. The discharge is just white and not really clumpy. It doesn't have an odor smell. And I don't have any type of burning or an itching sensation. I really want to know what is wrong with me. Can you help me out please?