I think the trick is to acknowledge that participating in it is not optional, unless you totally drop out of society, and even then, you’re still probably participating in it.
What you can do, with the choices you have available to you, is try to counterbalance this participation with actions and perspectives that work against the racism baked into the system. How one does that is different for everybody – we all have different choices available to us, after all. There is no magic answer, and no answer that is right for everybody.
Support progressive causes. Vote for progressive candidates. Support minority businesses. Treat the people you encounter in life as equally worthy of respect, despite topical things like the color of their skin. If/when you slip, recognize it, attempt to make amends if necessary, and get back to work. 
You sound like you’re very open to trying to live in a way that betters the world, and for all I know you’re already doing all of the above. My personal advice – don’t let those who cling to toxic anger to the point of approaching nihilism tell you that the above types of things do not matter or affect positive change. They DO.
