Hi
I think that narcissism is a totally natural and predictable result of trying to grow boobs.
After all, growing boobs is all about body image, and looking to see if what you see in a mirror is getting closer to what you want to see is what it is all about.
Incidentally, have you ever tried walking down a sidewalk / pavement alongside lots of parked cars, and looked at the reflection of your chest in the car side windows. Don`t turn your body to face the car, it is the side view you want.
Most car side windows are curved, and the curve emphasises the shape of your chest - your boobs stick out more, and you get a more noticeable cleavage.
Enjoy your narcissism, I do it all the time.