Hi! I'm a thirteen-year-old girl, and I got my first period around August 25th (I can't remember, it might have been July though. Somewhere around then) 2017. It was consistent up until December, and what with it being on the 25th, I figured that I would get it around Christmas time. Only problem is, I didn't get it that month, and I still haven't by the time of writing this (January 14th). Is this normal, or should I go to a doctor? I am a virgin, and I've never had a boyfriend, so there's no chance that I could be pregnant.
This is just making me feel incredibly nervous and scared that there's something really wrong, like cancer or something, although I know that that's ridiculous. Does anyone have any advice, or just why I didn't get it? If I get it this month then I will edit this accordingly, but I'm not holding out that I will.
Thank you for your time.