Why Are Teens So Self-conscious?

I choose this topic because it is an issue I can relate with the most. I am a teenager myself struggling through personal issues. Sometimes, those issues deal with emotional/mental health. Being in high school, I already know that teens get bullied around, and feel bad about themselves because they're not as "cool" as everyone else. This can lead to social problems or something far more drastic. Throughout this investigation, I plan to answer my question and understand why people feel the way they do. Also, to come up with a solution to try and minimize self-consciousness. No need to fear though, we, the teens, are all one in the same! =)