waves of spacetime

As far as I know, matter is a condensed form of energy. Einstein showed this through his famous equation, E=mc². What is energy, then? I think that energy is movement, or vibration. All matter exhibits both wave and particle properties, this is called wave-particle duality.

Matter and antimatter annihilate each other because they are opposite waves.

If energy is movement, movement in respect to what?
I think that these waves (of which everything is made of) are, in fact, waves of spacetime. Maybe spacetime is made of particles, like, "atoms of spacetime". This would mean that spacetime is all that exists, everything we experience is a consequence of waves in spacetime.

Maybe gravity is not matter affecting spacetime, but waves which affect the density of spacetime. Where there are waves of spacetime, there is more space, more time (or less, as we will see). Where there is more space, more waves can be there, they also increasing space and so on. This may be gravity. Also, if there is more time, time goes by slower.
There may be positive and negative waves of spacetime, positive waves increase the density of spacetime (matter), negative waves decrease the density of spacetime (antimatter). This would mean that antimatter is repulsive towards antimatter, a kind of antigravity. So, matter attracts matter, antimatter repulses antimatter and there's no attraction or repulsion between matter and antimatter.

Maybe there is exactly as much antimatter as matter in the universe, but antimatter is very scattered and we don't detect it. If antimatter repulses antimatter, it would not form stars or planets, or anything really. Maybe antimatter is the reason why the Universe is expanding, because of its antigravity.

Maybe the speed of light depends on the density of spacetime, just as the speed of sound depends on the density of air. This would mean that light travels faster in strong gravity than in no gravity.

I believe that finding out what exactly is spacetime will be the basis of the "theory of everything". I think the answers lie there.

These are just my ideas, maybe they are wrong, my knowledge and understanding of physics are weak.