Removing phone number from iMessage
You can remove your phone number from Messages on your Mac and iPad. On your Mac, go to Messages > Settings > Accounts. Select your account. Uncheck the box corresponding to your phone number. On your iPad, go to Settings > Messages > Send &amp; Receive. Uncheck your phone number.

You cannot remove your phone number from receiving messages on your iPhone, because this is also where your text messages come in. However, you can set your email address as the default. This will guarantee that all new messages sent from you will show your email, and all responses will come back that way. Go to Settings > Messages. Select to "Start new conversations from" your email. I hope this helps.