Removing my number as an option for iMessages?

I have an iPhone & my mom has an iPod & an iPhone. All of these devices were registered under the same apple ID. In both of our iMessage settings, my phone number is an option to be able to send & receive iMessages. On her phone my number is unchecked so she can't see my messages. But, I'm afraid she will check my number & then she can see my messages without my knowledge.So, I was wondering how can I make my number not an option for iMessage? Meaning how can I remove my number as an option for iMessage on all devices. Sorry if this doesn't make sense but please help?

When some1 has your phone number for their iMessage they don't have a name for you and have your number. To get rid of that you must edit the settings to put in a name for it and not just show the number.

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