What Causes Chronic Vaginal Discharge?

This is a long time doubt I ve had. Since I have memory, I ve always had vaginal discharge. Sometimes is clear, sometimes white-ish, different consistencies. They re out there every day, sometimes less, sometimes more, but they diminish before my period and right after it, they resume. I ve never had any kind of vaginal discomfort, no itching, no pain, no burning while urinating, nothing. However, my mom seems to think it s not normal (or that it is dirty) and I have no idea if other women have these because asking seems inappropriate. Is it normal?