There is only one thing that we are equal of and that is being loved by God. I will not say that God loves us all the same, simply because I do not know and would not want to speak for God.
God sent His son to be a living sacrifice for each one of ours sins. If that is not an expression of love, I do not know what else is.
God did not create us equally because we all have different skills/talents. To some He gives the gift of tongues to others the gift of healing, to some prophecy, to some wisdom, etc. See we are not all the same.
God does not treat us all the same. The parable of the talents demonstrates this. In this parable, one servant is given 5 talents, one 2, and one only 1. God knows our abilities and give us according to them.
God chose David because of how David responded to God. He did not choose someone else.
God chose Moses and Abraham again because of how they chose and responded to Him.
I believe that God favored Cain, but Cain let Him down when he did not bring the best he could as a sacrifice. Cain’s attitude was I should be treated the same as Able even though Able did as instructed and brought the best of the best and I did not.
Somehow, we have come to expect everyone to be the same, not stand out, not make more than another, have the exact same everything, etc. That will never happen because we will always have rich and powerful people. Communism, Capitalism, and Socialism all have those who are rich and powerful and those who are not. Capitalism is the only one that has different ranks of economic status. The other two you are either rich or you are poor. You can disagree, I do not care.
If the world were equal, I would not have been turned down for jobs which I was highly qualified because of my gender and race. Yet I was on multiple occasions because I knew people in the HR departments or I knew the hiring manager and was told exactly why I was not hired.
If the world were equal, all those people who are stealing money from the rest of us in the form of taxes to live on without ever contributing anything to society would be immediately cutoff and told go out and get a job.
The world is not equal nor is it fair so it is time we get over ourselves.
You may say God has propagated this unfairness. God never said you everything was going to be fair. In fact His son said that He whom believes in me will have a harder time in the world because the world hates me and it will hate you.
Satan has been and always will be the enemy. He spreads lies, He spreads hate, He spreads fear, and He spreads this notion that everything should be fair.
Fairness would be death to all of us because of our sins, but again God sent His son to die for my sins and to die for each of yours sins so that you can live in Heaven with Him for eternity.
So the choice is yours. You can be angry with everyone and expect the world to be fair or you can accept the world for what it is and live in the world but not of the world.
I pray that your attitude changes and your realize that nothing is ever going to be equal. Instead lean towards God and His ways.