Jane thanks, but couldn't you write some more specific things or advice? For example, what do you mean by that system? what system? ...
I'm happy to be more detailed here, but we can have more of this conversation by email if you agree Jane, because it's not chastity specific at all.
Wearing a chastity belt may physically stop a girl from masturbation and increase her safety when it comes to sexual assault, maybe. But it wearing a metal belt isn't going to do much to prevent excessive sexuality or other levels of inappropriate behavior. Struggles with concentration are also not going to go away (will possibly get worse at times) when you are wearing a belt. Chastity belts are a pretty modern invention (last few decades at best) and while they have their benefits, wearing metal underwear is not going to address a number of things you identify.
You said, girls were "calmer, more focused and so wild, even in sexual matters, and that traditional values and order were right."
Remember, chastity belts didn't really exist in those times. Obediance was more caused by some very strict limits on what girls could do - limited time outside home, supervised activities, required study time, strict dress codes, chores, obedience tests and severe punishments for disobeying. So, less than the girls wanted to be calm than they learned to be silent and quiet and do as told. Now there are girls and ladies your age and older who still get treated like this, want it and like it (or at least tolerate it). However, it's the strict system and structure that enforces the 'calm, and traditional values and order'. Wearing a metal belt? Won't get to the outcome you're looking for. The belt can be part of such discipline sure, but an overall system and rules need to be worked out with your parents in detailed discussion.