Hello, I am 14 years old. I started my periods when I was 10 and they have always been regular. Over the past 3 months I have got more irregular, being a little late on my period every month, and In November I completely missed a period. I haven't had a period since the 3-9th December and I am now 10 days late. Me and my boyfriend haven't had sex and I'm still a virgin, however we have done some other sexual things and I'm really starting to worry. I have generalised anxiety disorder but I have had this problem for 2 years so I'm almost certain it's not related. What could this be?