hey, my macbook was stolen, i wanna find it! how can i ? i can't find it with find my mac...

If your Mac is lost or stolen - Apple Support

First, you have to have Find My Mac activated, it is not on by default. Did you have it turned on?

Second, the Mac would have to be powered on and connected to the Internet.

Third, even if you could find its location, it's not like you can go there, confront the thief, and retrieve it.