the share my location option in iMessage is grayed out? How to I enable it?

Hello Mac5556.

Thanks for reaching out to Apple Support Communities. We understand that you are not able to share your location in the Messages app. We will be glad to assist.

Let's check your Location Services first: Turn Location Services and GPS on or off on your iPhone, iPad, or iPod touch

Additionally, if you use parental controls check to see if there are any location restrictions:

Use parental controls on your child's iPhone, iPad, and iPod touch

Cheers.