Hello jenb95678,
Thanks for using the Apple Support Communities. We understand that you're running into an issue with the AutoFill feature for Safari on your iPhone. When you go to Settings > Safari > AutoFill, do you see the slider is in the ON position next to "Use Contact Info"? If so, next to "My Info" is the correct contact card selected for you? It's possible to have multiple contact cards, so it's best to check just to make sure.
Automatically fill in your information on Safari on iPhone
Do you happen to have access to a computer? The reason we ask is that it's possible this issue is within iCloud Keychain. For more details about iCloud Keychain check out, Set up iCloud Keychain.
Best regards.