Hello!
I am 18 years old and I've been having a more unusual period cycle than normal. They have always been irregular (skipping 2 or 3 months sometimes) but lately seem to have gotten worse. January and February were pretty normal. Extremely heavy, but that's not unusual to me. I would bleed through two pads on a fairly regular basis. March/April/May/June I did not have a period, but I also began spotting periodically. Never for a long time, and the color was much brighter and thinner than I am used to. In July I had a period that was extremely light but continued for around two weeks. A week passed and I had another's period, again very light and lasting longer than typical. Also I do not know if it is relevant but I don't typically use tampons either. Only on very rare ocassions (maybe twice a year).
I am not sexually active. However, I do masturbate (non penetrative, so it's not that) and have noticed that after finishing I tend to spot.
If anyone has any ideas as to a cause or had similar problems please let me know!