Hi JasmineJancan,
It sounds like you want your phone number to show instead of your Apple ID in messages. We're glad you've joined us in Apple Support Communities. Let's see if this helps.
It looks like you've had the chance to review Set up your iPhone, iPad, or iPod touch. That's a great start, but we have some additional advice for you.
Follow the steps in Add or remove your phone number in Messages or FaceTime. This link will guide you through where this setting is on your iPhone and has guidance for other devices as well. You'll want to make sure your phone number is checked and not "Use your Apple for iMessage."
If the issue remains after following those steps, let us know what steps you had a chance to try from above.
We hope that helps with your question and take care!