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[–] The_Cat 0 points 1 point (+1|-0) ago 

What you're describing is not gravitons as they're hypothesized. What you're saying is called Le Sage's theory of gravitation and has long been discredited.

The way an interaction through particle mediation works is a little different. When a proton and an electron exchange a photon, they attract each other. The way you have to visualize it is not that these mediating particles "push", because that would just move the concept of force a level down.

How you have to consider it is that such a virtual mediating particle carries a bit of energy and momentum between two particles. This can be any amount of energy and momentum, and in any direction. The nature of the interaction determines what kind of energy and momentum values will dominate, making the interaction attractive, repulsive, or something else entirely. Feel free to ask more if you want.