When I was younger,
thirteen years old, I fasted Ramadaan and did not fast for four days
because of my period. I did not tell anyone about that because I felt too
shy. Now eight years have gone by. What should I do?

Praise be to Allaah.

You made a mistake by not making up those days all this
time. This (i.e. menstruation) is something which Allaah has decreed for the
daughters of Adam and there is no shyness in matters of religion. You have
to hasten to make up those four days, then in addition to making them up,
you have to offer expiation, which is to feed one poor person for each day,
by giving two saa’ of the usual staple of the country to one or more poor
persons.