I believe that I've become rather racist.
How do you know that you are becoming racist?
I've always been one and then I met a really interesting girl and she convinced me I was right
You shouldn't be racist towards groups. This girl sounds like she is making you worse. You should stay away from her.
She's just being honest. also
Having racist views of other people is distorted and wrong. Being racist like this is critical and hurtful to others. Treat other people the way you want to be treated.