I’m not sure what is my Apple ID !!!

Typically an Apple ID is an email address you have used.

This support article describes ways to find your Apple ID --> If you forgot your Apple ID email address or phone number - Apple Support

or go directly to this link --> https://iforgot.apple.com/password/verify/appleid#

If you still need help:

Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."

Contact Apple for help with Apple ID account security - Apple Support

Also look in Keychain, and in a browser's security settings if you use it to automatically sign into Apple when using a browser.

Settings > tap your name at the top

That's all from your Apple ID.