I HATE MYSELF.

 For some reason, many teens are afflicted with self-hate. Maybe you're not tall enough. Or skinny enough. Smart enough. Maybe you just plain suck. How do you deal with it? You don't know how. You don't know what to do. You just take your hate out on yourself.
(I don't really think you suck. I love you... the "you" wasn't as in "you" who's reading this but...yeah)
 My group (Sydney, Tajin, myself) is researching the connection between popular culture and teen depression. 
For example, women are objectified in the media. We all know this. We're supposed to be these lovely, beautiful, perfect creatures. But beautiful women come in all shapes and sizes in real life. However, because of the way we're portrayed on-screen, men and women alike expect differently. The scale of beauty is a 90lb, 6ft supermodel for everyone.
 How do teenage girls react to this, not being able to live up to those standards?
Well, by puking their lungs out, of course. 
Another example is the emo subculture. 
Emos are stereotyped for cutting themselves. Cutting is a type of self injury. The emo subculture glorifies cutting, and celebrates it as "okay." No, it's really not okay. But that's popular culture for you, glorifying what (in reality) is a stupid mistake. 
And, come on, let's not forget cyber-bullying. Popular media such as facebook easily allows this. 
The topic may sound a bit vague now, but we plan on pulling it together more within our actual project. 
Within the U.S., one in every 200 girls between 13 and 19 cut themselves, compromising 70 percent of girls who self injure. 
90% of those with eating disorders are women between 12 and 25. Thousands of boys are afflicted with these disorders as well (but it's mostly women).
I'd rather not continue blatantly copying statistics off of websites, so instead, I'll link it to you. 
http://www.teendepression.org/stats/teenage-depression-statistics/