Everyone is "mixed race," by your arbitrary definition of "race." There is no such thing as a "pure race" human being. However, under my definition of "race," there is only one race, the human race.
I am sorry you had a bad experience due to your skin color. I had a bad experience because of the spelling of my real first name. Others have bad growing-up experiences due to other issues. To reason from bad experiences of individuals to form general recommendations for everyone is erroneous. It is better to teach individuals how to overcome the bad experiences they will certainly have than to try to form general rules that encourage discrimination on the basis of skin color.
You make many assumptions. So far all of them wrong as well as condescending and banal.
Learn the difference between ‘race’ and ‘species’ or you will continue to reveal yourself as an ignoramus.