If you were under 22 when your father applied for PR, your age is locked in and you stay a dependent child unless you get married or enter into a common law partnership.
If you were 22 or older when your father applied, you need to stay a full time student. That means enrolling in a course and attending it at least until you land as a PR.
You can see more info at
http://www.cic.gc.ca/english//resources/manuals/op/op02-eng.pdf at page 8 for the lock in age and page 15 for the definition of a dependent child.