My iMessages are sending as emails not my number?

I have a iPhone 3GS and my iPhone iMessages are sending as emails, and I only have 1 receive at which is my email address and I have no caller id to add another one and i tried turning iMessage on and off what do I do

Added (1). When i turned my iMessage on and off I didn't work

Go to Settings. Then Messages. Receive at (your number).Remove any e-mails. Then test it out.

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