how can i found if find my iphone is enabled in my iphone before it got stolen?

Use any internet browser and log into www.icloud.com/find to see if it can locate it.

More information and options are in If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

If needed also see the "If Find My [device] isn't turned on on your missing device" section of If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

That means that you did have Find My iPhone enabled but the phone cannot be located because it is off (powered off or battery dead) or is not connected to the internet.