I am not in the business of diagnosing others, but if I were to take a guess I would say the low self-esteem which goes hand-in-hand with social anxiety has likely caused somewhat narcissistic behaviors to emerge as sort of a defense mechanism. Then again, having features similar to a certain disorder doesn't necessarily mean you are suffering from said disorder and the fact that you are so self-aware leads me to believe you most likely aren't exhibiting narcissistic personality disorder. From my understanding, narcissists wouldn't dare admit their faults to anyone-especially not themselves. Do you perhaps think your worries are simply caused by your OCD? I recall reading those with OCD-some, not all of course-tend to fret over whether or not they have serious diseases or disorders and the like. Whatever the cause may be, it is good you've taken the time to assess yourself, identified where improvement is needed, and desire to work towards a solution. The fact that you are so worried about this indicates you are not a horrible person. A horrible person would not care whether they hurt others or whether they were too self-centered. The obvious solution is to work on your self-esteem, as doing so would erase the reason for these coping mechanisms. Unfortunately, I am not really certain how one does that. I always feel better when I learn new things, so perhaps you could go that route.