iMessage

There's a couple things you can try, but don't worry, it happens.

Does your carrier support iMessage? If it's one of the main carriers (ATT TMobile Verizon) it does.

• Try deleting all your messages first
• Make sure time settings are "synced". Open Settings → General → Date & Time and toggle the switch on Set Automatically to ON.
• Make sure iCloud (via your Apple ID on Settings on a Mac has the Messages checkbox "ON".
• Restart the iPhone and make sure you have a good wifi or carrier connection.

Try this and let me know.

Try this https://support.apple.com/en-us/HT201422

If it doesn’t work, reset your iPhone to factory settings and start the process again.

Please let me know.

On your iPhone, go to Settings and Messages. Toggle the button for iMessage.

Let me know how it goes.