Philadelphia students 'scared to go to school' as gun violence escalates

Students are running on high stress as Philadelphia's extreme gun violence inside and outside schools continues.

Joshua Corneilius, 17, should be enjoying his senior year of high school, but instead, he is constantly worried about the violence occurring both inside and outside of his North Philadelphia school.

In the last year, nine kids at Simon Gratz High School were shot to death -- three of them just last month, the school's principal, Leyondo Dunn, told ABC News.

"It's a war zone, like with the drugs, with the guns, with the violence, it's a real war zone. it's a real dog-eat-dog world, like it's not for anybody that's soft," Corneilius said.

"If you live in Philly, you're going to naturally become hard ... like you're going to have armor, like you'll have a shield."