It is a brave thing to open yourself up to feedback here and I think everything you are talking about has more to do with you being fifteen years old than a personality disorder. As a teenager, you will be more egocentric than what will typically be true for you later in life. It is a very well-established fact that adolescent egocentrism is part of the developmental process and it is a necessary stage in development. According to adolescent psychologists, it may actually have a lot to do with future healthy psychological growth.
It is natural to think about the things you are thinking of- for the most part. The parts of your character that you’ll want to be more mindful of try to change are those parts that lie to get what you want and thinking you are always right. These are common character flaws that will not serve you well as you mature. Struggle to be more honest with yourself and others—and listen more to what others have to say. This will help keep you more balanced as you mature.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral