Due to “Conservation of Energy” the energy used to create an anti-matter particle is far greater than the energy you could gain from a matter/anti-matter reaction from the resulting particle. The rest of the energy used in a particle collider goes into heat, creation of other “matter” particles and also into entropy. You would need to find planets or asteroids made of the stuff. If it existed, we would see occasional massive explosions in space from accidental collisions with matter.
I found a link. See Post #75.