What's wrong with my iMessage on my iPhone?

The contact set as me was messed up but I fixed that and the messages still won't work. Whenever I try to send something to my mom, I receive a message from myself of what I just sent ad IIm not sure if she s getting the message at all.Also, someone sent a message to her and I received it, but she did too and I just have no idea what's goin on with our phones. My mom also just got an pHone 6+ and that might be why they re messed up because we all use the same apple account but I don't know how o fix it.

Stop using your Apple ID for iMessage because you're all just sharing messages that way. Use your number and only your number for iMessage.