No period in 2 months but I’m a virgin?

So I haven’t had my period in over 2 months (going on 3), and I’m getting worried. I’ve skipped before but this has been pretty long. I’m a virgin and I’m at a healthy weight. I eat pretty healthily and drink lots of water. I exercise regularly, and I had my blood tested recently. I was only lacking in Vitamin D and now take supplements for this.

It’s probably just my wacky hormones because I’ve always had irregular periods and I’m 15 (although I heard it was supposed to stable out after 2-3 years, and I’ve had mine since I was 11?).

Does anyone know what could be causing this?