Any royal can abdicate their throne. It's their right. Just because someone is born into royalty doesn't mean they want the responsibility of it. However, abdicating has some massive backlash in terms of its effects. The next in line becomes the leader/figurehead/etc. (if there is a next in line), you can not take it back no matter what, you are no longer eligible for royal inheritances, and other things as well. Abdicating is a very tricky thing and that is why you almost never see it happening.

And I still abdicate my position as translator. This is nobody's dream job.