IMessage recieved as email????

My message settings are messed up now for some odd reason. Under Imessage it says "waiting for activation..." and under "send and receive" it only has my email address, NO phone number. Ive been to told to find "receive at" but that is now not an option but it was at one time. I can send IMessages but the receiver gets them from my email address instead of my phone number. Why cant i use my phone number to send IMessages now? How can i solve this? Ihave reset all the settings multiple times. ive turned my phone off and back on multiple times and i have also turned imessage on and off many times. NOTHING WORKS!!