The singer, whose mother is Irish-American and father is African-American, explained that she felt like an "outcast" when she was younger.
She said that she believes President Barack Obama has contributed to a "new world" where ethnic diversity is more accepted.
Carey, who is expecting her first child with husband Nick Cannon, explained to British Pride: "Having Obama in office and bringing a child into the world at this point is totally different than me feeling like an outcast when I was growing up and not feeling like it was okay to be ethnically diverse, and I can't believe that we have arrived at this point within society."
The 40-year-old explained that growing up not looking the same as either her mother or father was an unusual thing for her but is happy that her baby will not feel the same.
She added: "I think it's a little bit easier now because the world has changed just in terms of identifying yourself.
"That always felt like a strange thing to me as a child, not looking the same as your own mother of father was a very different thing back then."