Hello gamer520,
First, let's make sure that iMessage is set up correctly on your device. This page outlines how to ensure iMessage is set up, and that your device is signed into iMessage: Set up Messages on iPhone
Sign in to iMessage
Signing in to iMessage keeps your messages up to date and available wherever you're signed in, and it backs up all the messages that you send and receive on iPhone. When you communicate with others using iMessage, you can use more apps and features, like collaboration, read receipts, undo send, audio messages, Memoji, Animoji, and more.
1. Go to Settings
> Messages, then turn on iMessage.
2. To select the phone numbers and email addresses you want to use with iMessage, go to Settings > Messages > Send & Receive, then choose from the available options below “You can receive iMessages to and reply from.”
You can see all the messages you send and receive on all your Apple devices where you’re signed in with the same Apple ID and have iMessage turned on.
Just to confirm, are you currently receiving any errors about iMessage on your device? If so, please check out this page that has information that can help resolve several errors: If you can’t turn on or sign in to iMessage or FaceTime
Thanks!