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Some variations in period cycles are expected during periods of stress for example, however they shouldn't be less than 21 days or more than 35 days on a regular basis, and there shouldn't be large variations (>2 weeks) between your longer and shorter cycles. These are features that require further assessment and potentially investigations to rule-out possible causes such as thyroid disorder or polycystic ovarian syndrome (PCOS).
You may not have anything to worry about, however given that you have some of those abovementioned features requiring further assessment, I would recommend for your to speak to your parents and/or arrange a review with your doctor for a more detailed conversation about this.