I would like to hide my 2nd phone number from my apple family plan. How do I hide family numbers or my one number from the family plan?

I have two Apple iPhones on two different carrier plans. I am able to use iMessage and FaceTime on any of my devices which I like. I also just started a family plan for Apple Music, Apple TV, Apple Arcade and iCloud. I would like to hide my 2nd number from my family members seeing it on our plan. Is there a way to do that? In the family plan, do the other family members have to see all of the other members or contacts? I just want to hide my 2nd phone number. Thanks!