Didnt I just tell you where it came from? Also, who told everything has to come from something? You cant know this. No one does. Also no one claims he does, except for religious people.
You are going back on what you are saying. You just said that you believe that the reality of nothing didn't exist. The theory behind the big bang is that is where it started.
The Big Bang Model: Modern cosmology dictates that all matter, energy, space, and time had a finite beginning around \(13.8\) billion years ago. This implies the universe had a starting point rather than being eternal.
The big bang did not poof at random and create all of life as we know it.