So i thinking to make my own handgun with rubber bullet as it ammo, mainly to protect myself in case i got assaulted again when i walking in the road.
is there anyone have a link where i can get an info of how to make it? so far that i have found in google is only a toy gun with rubber band.

Just buy a knife or a gun, or a tazer, or really just anything other than a home-made rubber bullet gun. The fact that you're asking random people online, especially on a site like this, for advice just shows that you probably don't have the requisite knowledge to make something like this work.

Who can teach me to hack