How can we generate a wormhole?

The thing that is stopping us from doing this is that we don't have the ability to manipulate gravity, to do that, you would need a material of infinite density. You would then have to place said material inside of a star close to going supernova. The star would have to be big enough to glow violet, witch is the color of some of the most powerful stars. When the star goes supernova, if it is big enough, it should provide a nice gama ray burst. The star would then implode upon itself causing the particle of infinite density to then implode thus causing a man made wormhole. Now the gravity thing, you would need to somehow retrieve the other end of the wormhole, so, you would have to manipulate the gravity to where the wormhole sucks the other end through itself. Even then, you might destroy the wormhole in the process.