Important to say in the beginning: It was already mentioned many times on this forum, but parents forcing their children to wear a chastity cage would be lawfully considered abuse. I see from your profile that you're located in Germany; I'm no expert on German law, but it should be way similar to what we have here in the Czech republic.
Secondly, what do you mean by "no longer consent"? By this, I imagine that you were completely fine and agreed to wear the cage, but now you have changed your mind. Why did you reconsider? (Or is this just a communication mistake ...?)
Now, to finally answer your questions: I'm locked since I was 15, reluctantly, in the beginning, to be honest. I tried to remove the cage myself a few times (yeah, it's hard, but still possible), but I was always caught and punished for it. During the first months without release, you'll learn fast to put up with the urges and that you can't really do anything in your boxer briefs. My advice, which I told my brother Jake numerous times: "Everytime you're horny, workout"; for me, it helps.