Thanks for writing in.
As per your symptoms in history; it does not look like it is normal. More likely it is PCOD
i e polycystic ovary disease. You need to consult gynecologist for getting ultrasound
scan done. Once hormonal
imbalance is treated periods will become regular.
Again as you have bleeding after masturbation
after just arousal , that means some thing local lesion is present which need to be treated.
The bleeding could be due to dysplastic changes in epithelium or because of sexually transmitted diseases. It needs to be examined thoroughly.
So consult gynecologist for same.
I hope I have answered your query. In case of doubt, please feel free to revert back.