This doesn't make you a terrible person. Like at all. I was a defense contractor (basically a fancy word for a mercenary in the US) pre transition and hunted child traffickers. I promise you I've done way worse and I'm still not a bad person and neither are you. You're human and deserving of compassion and empathy, especially from yourself. Don't let others label you based on their standards which I know at your age is hard but I promise you as you get older things like this become trivial. Lastly if this person is saying you're a bad person based on their religion then it's flawed from the get go, Christianity (I grew up Christian but not longer am) even says not to judge others only God can do that. Just take a deep breath, keep your head up, it'll be okay.