Discharge

Mae • I am 22 I'm not dating anyone. I like sex I am using this app to educate myself and to track my cycle.
So I have this problem with vaginal discharge. It is a white color but it isn't chunky it is just milky like Idk watery almost and I have this discharge all day everyday until my period starts and then its of and then back on as soon as my period isn't on anymore. I have never had an infection before. This started happening this year. What is wrong with my body???  Please help