I had very irregular periods like that too and so does my sister your age too. Mine soon became coming every month within a year and by two years they were evening out perfectly. I'm 17 now (had it since 13) and my cycle is exactly 28 days and lasts for 4-5 days. It's great now I never have to worry about when its coming I mark it on my calendar and I started using a period calendar when I first got it and kept track of the days I got any sign of bleeding and how heavy my flow was. Helped me understand my body a lot more.
I would not worry too much. If you just started your first period in November, you are probably just irregular. But it could be something more serious, so you should talk to your mom about it. My 16 year old went 6 months once without a period, and it ended up being polycystic ovarian disease. If you continue to not have a period, you should talk to your mom about it.