I still replay my shot on a buck I lost about 7-8 years ago. It still makes me sick to my stomach every time I think about it. But I do take a little comfort knowing that I did everything I possibly could to recover that deer. Just ask my wife about that day she'll probably remember it, I was miserable and grumpy for about a week. Piebalddoe this shows you are mature beyond your years and really care about the animals you hunt. Try not to let it bother you too much. The best thing to do to get your confidence back is to go out and practice shooting. To show yourself that you can make the shot. Keep yer head up kiddo, look at it this way mother nature is not always the nicest to God's creatures and causes them to suffer. But in this instance you have probably provided food for some other of God's creations