I am a shy person. I spent a lot of my time in school avoiding talkative people and the spotlight. I was never moody the way I am now. Which is quite normal for people with Borderline Personality Disorder. My identity issues began around the time I was sixteen. It's normal for teenagers to try different things, they go through "phases" trying to fit in with certain cliques or groups. I started out the same way. 
     Whenever I played basketball with the more popular girls in school, I started wearing everything Aeropostale, just like them. I began to copy how they talked and acted. Shortly after the season ended, I stopped doing that. Then I was influenced by the show "Project Runway" to adopt a Californian accent and trying to dress fashionably. And I refused to shop anywhere but Macy's. Things changed again whenever I got a job at Subway when I was seventeen. I dressed lazily- I cursed more, picked up the lingo and talked with a copied smoker's rasp. 
^This is the first half of my blog which I started yesterday. If you're interested, you can check out the rest there: http://butterflewone.blogspot.com/ 
I was wanting to know if anyone else experienced this, and if so, how you deal with it. Thanks :) 