How does the media manipulate the minds of young teens (females & males)?

[Sexie Mama]

I came up with a few arguement points, but I need proof.
Please help me out.
The media changes the way how young girls think etc.

here are the arguement points:
1) weight and body (girls want to look like the barbie dolls they see on tv or in music videos)

2)Sexually active (media tells young teens that it is okay to have sex at a young age in order to socially fit in with the crowd)

3) Drug-use and Violence (movies, music videos, Tv shows all have violence in it and use some type of drugs which effects a teen's mind)

I just need to find more proof, can you guys please help me. I am suppose to write an essay.

Please cite the websites if you got any information from it.

THANK YOU SO MUCH!