I only 13, and I'm still a virgin, but I have this strange white discharge? What is this? (not an infection)

How do you know it's not an infection?

Is there a lot of it? Does it have an odor?

Maybe you should discuss this with your mother and ask a Doctor for his/her opinion.

I notice that you are on birth control at age 13 even though you have never been sexually active - https://www.askmehelpdesk.com/womens-health/what-can-do-make-period-lighter-473800.html#post2367476. You obviously already are seeing a Physician (who described the birth control). That's the person to ask.

I also noticed that you have posted conflicting things in the past because a friend hacked into your account (or something). Perhaps you should change your password so the same info is posted on all of your threads.