It sounds like someone else is using your Apple ID and/or account. Does anyone else in your family use your account on another Apple device (iPhone, iPad, iPod)?
If not, you should contact Apple and also change your Apple ID password as soon as possible. If items are being charged to your account and you are sure you haven't given your account details to anyone, then changing your password will at least stop the unauthorized users from purchasing items with your account.
https://support.apple.com/en-us/HT201355
Hope that helps!
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