If we expect that we will be treated fairly we will be disappointed. The notion of fair is a fallacy, or perhaps a better statement would be that fair is the social equivalent of the problems given to first year physics students.
In these problems students are told to set aside any factors that complicate the problems such as friction. This is done to allow the student to understand the concept. When we worry about things being fair, we disregard the differences in given situations.
When we see someone getting the things we want we often look at how we are qualified and they are not. Like the physics student disregarding friction, we disregard the other factors. We don't see their skills or connections.
When we worry about the things we are not getting, all we get is jealous.