Haven’t gotten my period in months?

I’m 17 years old and am in good health. I eat a good mix of both junk food and healthy food (typical for a teenager) and weigh 135 lbs at 5’6. I get at least one hour of excessive a day through evening walks and my yoga class. I get around 6 hours of sleep at night and have no major health issues. However, I... show more I’m 17 years old and am in good health. I eat a good mix of both junk food and healthy food (typical for a teenager) and weigh 135 lbs at 5’6. I get at least one hour of excessive a day through evening walks and my yoga class. I get around 6 hours of sleep at night and have no major health issues. However, I haven’t gotten my period in about 5 months. I’ve always had an irregular period since I first got it when I was 12 but I’ve never had it skipped for so long. I am a virgin and not on any birth control or medications. Is this normal or should I be concerned?
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