All you can do is, pick your head up and keep hunting. Shooting at game is always different than shooting at targets. If you took a high probability shot, feel you did everthing correctly and something went wrong, then just try move on. NONE of us like to wound a deer and not recover it. In the excitement, it is easy to make mistakes. Believe me, I have shot and not seen the small tree right in front of me. It happens to everyone. Good luck and safe hunting.