The majority of all humans are dead. Actually, the majority of all humans decomposed so long ago that it’s somewhat likely that the particular matter that made most of them up has already been cycled back through the cycle of decomposition and re-absorption several times. Some of that matter has made its way to you; some of it has made it back to the last meal you ate, and yes, that includes vegans.
For any two humans alive today, it is overwhelmingly likely that they share an earliest common ancestor within the past 6 generations. Even assuming the greatest difference, that being that you both have the same number of ancestors between you and your earliest common ancestor, you will probably marry your 4th cousin (you can trace a common lineage back 4 generations); the likelihood that you will marry someone outside of your 6th cousin is statistically insignificant, and yes, that includes if you marry someone from another ethnicity.
Despite these demonstrable facts, that you have eaten what was at one point part of a human body and that you will or have already married someone with whom you share a significant genealogical similarity, you are neither a cannibal nor in an incestuous marriage. I’m using “you” in the likeliest of all possible antecedents; you, the person reading this right now may actually be the inspiration for the movie Deliverance, but most people are not guilty of these two near universally-accepted aberrations.
None of this will have any impact on your daily life, nor should it. Carry on as you were, unless you want to change something, then do it. The pursuit of happiness is a modernist pipedream; if it had any bearing on reality, I might call it a myth, but since really just an excuse to do whatever they want, I’ll instead call it a lie. Your fabricated right to pursue happiness have two hard boundaries: the brutality of real life, and the people around you who also want to pursue whatever they consider to be happiness.
So carry on, I say, if that is what keeps you going. Pursue your damned happiness, even though it will kill you. Memento mori; remember you will die. Empires rise and fall because someone wants to be happy; there’s a different way. Happy are the poor in spirit, those who mourn, the meek, those who hunger and thirst for justice, the merciful, the pure in heart, the peacemakers, those persecuted for justice. When someone comes along telling you that these are the ones who are happy and blessed, do what all the other incestuous cannibals did: kill him. Memento mori; did he die happy? Or did he die with a better understanding of the world than we can hope for?
Eventually, you will die, too, and be eaten by the things that will be eaten by the things that another human will eat. Eventually, your offsprings’ offsprings’ offspring will marry and produce more offspring that will also die. If the reality of your own past shouldn’t be an atrocious affront to decency and shouldn’t affect your daily life, why should the same reality flung into the future? Carry on.