Actually :P when antimatter meets regular matter such as anti-hydrogen coming into contact with normal hydrogen they would both be transmuted into photons so for every anti-particle that interacts with a standard particle there is always an output of two photons a+b=2P
the thing is that antimatter, yes is everything, but the opposite, so if a antimatter particle of hydrogen reaches a regualar particle of hydrogen they would cancel out into nothing, in this i have sing and antimantter and they make something new, when normaly both would only destroy stuff (antimatter cannot create new things in real life, only destroy)
antimatter=anything really=phot