Guys someone please explain

So I'll keep this short but basically there's this a... uhhhh... person in our school that looks like a female (in most aspects), but like their voice is super deep and like I'm pretty sure they don't wear a... uhhmmm... thing that girls wear.
But this came to my attention (again) recently when I had heard a fellow classmate talking about an encounter with this person in the BOY'S BATHROOM. This reminded me of the time that I had also experienced an encounter with the same person. I walked in to do my business and as I walk in, in the corner of my sight I see this same person fixing their hair. I had mostly forgot about it until the same thing happened to another classmate. I mean I am just really confused. The first time I thought about contacting Reddit (that would be you) about it, but as I said before, forgot until it happened again.

Edit: Thank you guys for all your help! I'm glad you guys were willing to help me understand, and I really appreciate it!