Dont feel too bad about it because its all part of the game. You got to take the shots that are given to you. They all cant be perfect ones. Recovering from a lost deer or missed shot is one of the most important lessons a hunter can learn. Real hunting is about risk and taking calculated risks.
I sometimes laugh at alot of the hunting shows out these days. They turn down shots on Texas deer farms that no hunter that hunts state gamelands would ever turn down.