Does the NFL really have a cause that prevents 100% Asians from playing professional football?

I am an Asian and a huge football fan but I was recently told that people who are 100% Asian can't play in the NFL. I know that Hines Ward is like a Tiger Woods and Ed Wang has a deep black man voice so I don't really count him either. The Patriots have Patrick Chung but I think he's Asian like the Wu Tang Clan is. I just don't think it's fair to limit the opportunities of people who may be a bit smaller and less athletic than other races.