What happened?

So what happened to all of the Anti-Matter ? Why is our universe mainly consisting of matter ? I was reading that astronomers were / are looking for regions in space where antimatter may exist but that there would be tell-tale signs because of when matter & antimatter contact and annihilate and make pure energy and we would see the regions where the two areas met. Probably very energetic gamma ray emissions or something like that. It would be amazing if we could actually harness the energy but from what I was reading it would take 1000's of years to make enough antimatter to use and then the problem of containment and keeping it from contacting with matter.

Manny