having to be the center of attention is the criteria of some diagnoses. but you need to meet more than on criteria to recieve a diagnosis. but i would re evaluate the accuracy of your first statement about her being a friend who is always there for you to listen. it sounds like she is a person who is always there to one up you. it doesnt sound like she is being there for you at all, she doesnt seem to be listening to you at all, and doesnt seem like much of a friend. friends listen to you, they care about your feelings, they talk about your needs. what type of friend is she? i am sure you have only described part of her.