How do I find out what my Apple ID is where do I go on my phone

You can check to see if you're signed in to the App Store, FaceTime, or Messages on your iPhone, iPad, iPod touch, or Mac, or check to see if you're signed in to iTunes for Windows on a PC. You can also go to iCloud.com or appleid.apple.com and see if your Apple ID prefills on the sign-in screen.   

Hey there,

Go to Settings > tap on your name > you will see your Apple ID under your name!

if you forgot your Apple ID email See this article ☞ If you forgot your Apple ID email address or phone number - Apple Support