Why is the tv/film industry dominated by white men?

It doesn't matter what channel I watch.Everyone on every channel is predominantly white.Every cartoon I watch is white.Even the cartoons that have inanimate objects take on a white persona.I'm not racist,I just wish there were some black heroes for me to look up to on tv,but there aren't any.Races don't always matter,but it doesn't hurt to watch or learn about someone that shares some of the same history as you.