Why is my Imessage all messed up?

I have an Iphone 5 and recently updated the software to the new IOS7, well now my imessage send to other iphones as a weird number. It doesn't even have my number as an option to send from and there's no way to add my own phone number or change the number its on. Why is this and how do I fix it?

I had a similar problem on my 4S… I fixed it by going into settings, messages, send and receive, SIGNED OUT of my Apple ID. It then automatically turned my iMessage off. So I turned it back on and it said waiting for activation, it then automatically activated it to my phone number as there was no email address on the account. You can add an email address after if you want, the usual way on "send & receive" in message settings

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