Almost 19 years ago, Dylan Klebold and Eric Harris entered Columbine High School with an arsenal of weapons and explosive and killed 12 students and one teacher. Amy and Katie, students who survived the massacre, say that every time there’s another school shooting, they re-live the event.

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“It affects me terribly,” says Amy. “I’m now a mother of two and I send them into this environment that I feel isn’t safe. It’s a struggle every day to send them off to school.”

Katie adds, “It’s re-victimizing all over again. You relate to the sounds, the emotions. You’re at square one again. It resets my progress.”

WATCH: ‘There’s No Words To Describe The Feeling Never Seeing Your Friends Again,’ Says Survivor Of Florida High School Mass Shooting

In the video above, the women also discuss what it’s like living with survivor’s guilt.

On Thursday’s episode of Dr. Phil, the women offer their thoughts to students who recently survived the third worst school shooting in U.S. history at Marjory Stoneman Douglas High School in Parkland, Florida. Check here to see where you can watch.

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Columbine High School Shooting Survivors Offer Advice To Teens Who Survived Parkland, Florida Shooting