I'm mortified because I think I might be racist
It's not great to be racist. Why do you think that you may be racist?
I think I may be racist because I don't like people that are not from New York
You should not discriminate against all the people that are not from New York. You are leaving out a large amount of people that you will come across in life. You are judgmental, but not necessarily racist.
Being racist does not necessarily mean I hate all those people. I just don't like the way they talk and act.
You should try to be more open minded about getting to know people from other places. Don't you think the world would be boring if we all behaved and spoke the same way?