Not sure why you are applying for a green card (of course we don't know all the facts here) but some thoughts:
If you were born in another country and one of your parents is a U.S. citizen, you might become a U.S. citizen at birth if your parent lived in the U.S. for a certain time before you were born. If you didn't become a U.S. citizen at birth, you might still be able to become one because of your U.S. citizen parent. This is called "derivation of citizenship."
The wait time should be shorter.