No period for 6 months?

Uuuummm, you NEED to see a doctor about that, it could be very serious! It's already strange that you only get it every 3 months, but to wait this long without going to a doctors is crazy!! Hun you really need to tell your mom about this, it's nothing to be embared about, she'll tell you what to do, a mothers advice is 1000 times better than the internet. Hope I helped! good luck! =)