I haven't had my period since January and I'm still a virgin

Hi, I'm 16 and I can tell you that I've been through this before...I've heard plenty of times that periods can be irregular due to exercise, weight gain/loss, anf even stress. I would talk to my mom about it and go see a doctor. I once had a friend who didn't get her period for 5 months! She was freaked out, went to the doctor and he told her that she would be okay. I'm sure you're fine (: good luck!