Jana
Hello Jana, welcome to the forum.
Perhaps you should start with deciding when and where you'd want to wear it. In my opinion there should be no need to completely eliminate masturbation, just bring it down enough that is doesn't effect your life negatively. So which are the 'dangerous' times, where you feel the urge, but feel you shouldn't be touching yourself?
When you are alone in your room during the daytime?
Does it also affect how much you sleep, so should you need to wear it at night too?
If you have never masturbated outside of the house, you probably won't need to wear the belt away from home - and avoid all the problems with keeping it hidden and worrying about it being discovered, and hygiene in toilets.
Decide for yourself when / how often you think it would be OK to masturbate.
Even if you think you might want to completely eliminate it, don't start with that as a goal. First get used to it, see how it works out, and what improvements it brings. Thinking about chastity belts in a romantic way is quite different from experiencing it day in day out. I think you are still too young to decide to go full-time, if that is what you are considering.
If you tell your parents your school results are affected negatively, they will certainly be willing to help you to avoid that, and if you think this would be a good solution, they might very well be open to the idea. Of course I know nothing of your parents, but there is a risk that they really like the idea, and think it might be a good way to for instance keep you chaste until marriage, making you wear it more than you want. So take it slow, and only agree to specific periods. You can always extend it when it is working well, but it might be hard to go back. And of course they might be unwilling to even consider it, but then they should come up with a different solution for your problems.
