My phone has lost somebody stole my phone and he is using my own apple id

My phone has lost somebody stole my phone and he is using my own apple id

How can i find my phone

If you had (previously, prior to losing it), setup Find My, then Mark your device as Lost and use Find My to help locate your iPhone.

Read here: Use the Find My app to locate a lost or stolen device - Apple Support

I lost my old email address that was attached to my first iphone