I don’t think your racist but in order to shake off these ideas you need to be friends with more black people. The uncomfortableness probably come from inexperience. As for not being attracted to black women, I think that also comes with inexperience and maybe not seeing enough black women in your day to day. It’s not obligatory to like a certain kind of person, but it’s important to understand every person holds their own kind of beauty and being able to acknowledge that is very important. Now, I’m not saying go out now and push yourself onto a black friend to gain experience but if you find a friend that happens to be black and you guys share common interests definitely work towards building a bond with them.