I'm "pure" in this poll, purely one ethnicity (=exactly 7/8 "pure"). Nobody's really purely anything, unless they're some isolated tribals. It's impossible to know all your ancestors since their numbers increase exponentially per generation (obviously with more overlap the farther back you go). You can't even go by DNA since the reference groups may be mixed already.
neither racially nor ethnic wise... i dont really see why you say mixed race or ethnic people are insecure... alot of them are proud of it and accept it