If you didn't hate that an animal suffered I'd worry about you. Yes we kill animals. But we, or most of us, hunt for meat primarily. But most of us love these animals. I've killed several deer that had to suffer after being hit by a car. I never like to see any animal suffer. I will always take a second shot on an animal if it means less suffering for it. Not running shots etc though. My 2007 buck for instance. I hit high an broke his back. The shot was leathal for the deer. Hoe long would he have laid there and suffered? Probably a long while. I didn't want to loose him but also hated that he suffered one second longer than necicary. I spent the extra rounds gladly to end it.

If you can come to terms with what happened and feel like not hunting, by all means take a break. But don't give it up unless your sure.