my iMessage on my iPhone only shows my email not number.

Hi Natimweembe

welcome to the Apple (user-to-user) Community.

Re: problems with my iMessage and face time : activation is always unsuccessful : What do I do?

Thank you for posting your question to the Community, and for including your iPhone model, and up-to=date iOS.

You need a strong wi-fi (and / or cellular data) signal, and especially for FaceTime.

You may want to:

Check that you have a contact card for yourself, with email and phone number listed in your contacts app.

Check that you are signed in (to your iPhone) with your correct Apple ID:

How to: Sign in with your Apple ID - Apple Support

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In order to activate Messages app : How to: Set up Messages

How to: Add or remove your phone number in Messages or FaceTime - Apple Support

In order to activate FaceTime app : How to: Set up FaceTime on iPhone - Apple Support

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If apps are still not activated 24 hours after set-up:

Trouble-shooting activation: If you can’t turn on or sign in to iMessage or FaceTime - Apple Support

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If you still need more info. / help / support / contact (online chat, phone. email etc.):

Messages Support webpage: Messages for iPhone, iPad, Apple Watch, and Mac - Official Apple Support

or

FaceTime Support webpage: FaceTime - Official Apple Support

All the best :-)