I just feel a need for a little lightness. Watching this video makes me smile. There is just not that much difference between your teen and his/her two year old self. Remember your fiercely independent, demanding, and self-involved toddler!
Adolescence is truly a reenactment of the terrible twos. The developmental issues are almost exactly the same. Two and three year olds have figured out that they are literally separate human beings,with the ability to think for themselves, and move around their world on their own, all brand new ideas. And with this realization comes a new found feeling of power and control. See just like your teen.
So when your teen's bossiness and narcissism grates on your nerves, just picture them in their car seat, being all cute and bossy, and remember that it is just a stage!