"People are really brutal and horrible to each other, especially in high school. We've all been there, we've all experienced it and it can be really traumatising. Don't let them win... High school is not the end of the line! ... If you can get through it, there is a whole world out there that is just beyond people treating you badly." Maroon 5 star Adam Levine speaks out to bullied teens in a new online video.