my iPhone was lost and i forget my apple id

Follow these links, they will help you If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

If you forgot your Apple ID password - Apple Support

There's really nothing anyone can do for you. If you had find my iPhone enabled, you will need the AppleID to login to www.icloud.com to track it or erase it. Without the AppleID, there is nothing you can do.

You can try and recover the AppleID at https://iforgot.apple.com/appleid#!&section=appleid or call Apple and ask for assistance.