Thank you for your question. A gynecologist may be the best person to consult about whether or not your experience is typical or is symptomatic of something that requires intervention.
Beyond your direct question however, you note that you have "always" had irregular periods. Since you are in your mid 20s it would be a good idea to talk with your gynecologist and primary care physicians about your bone health. Regular menstrual cycles (i.e., periods once per month) are necessary for optimal bone health.
However, you may need to be evaluated medically to determine why your periods are so infrequent. Addressing any identified causes may not only regulate your cycle but may also regulate your mood and energy level.
If you are concerned about your bone health you can request a bone density test. This is a non-invasive procedure that is like getting an x-ray. Depending on your history, the most effective type of bone density test may be via a DEXA-scan. This type of bone scan evaluates your bone density in your non-dominant hip.
Best wishes,
Dr. Selby