Hello and welcome to Apple Support Communities, Ethannnn_25!
I see you've noticed that the FaceTime option is greyed out within Messages. I'd be happy to look further into what may be happening with you.
First, try the steps outlined in this article: If you can't make a FaceTime call on your iPhone, iPad, or iPod touch
If that doesn't help, please respond to the following:
- Are you able to FaceTime from the FaceTime app or Phone app?
- Are you using the latest update on your iPhone?
Thank you for using Apple Support Communities.
Have a great day!