I hate my friend, am i selfish?

Don't worry about her. You are completely right in your feelings that she is full of herself. This doesn't make you selfish. So don't bother hanging out with people who are like that. they're stuck up and no one really cares about those peoples' opinions. The reason most people hang out with those kind of people is because they think she's "cool" and they want to be "cool" too. It's peer pressure. Don't fall for it.