Maybe you were hunting for some of the wrong reasons for awhile and forgot what it is about it that thrills a 12 year old on his first hunt. You know what I mean don't you? Connect with some family or friends and always be more interested in their succes than your own. Never make a competition out of it. I have never entered a buck pool in my life and never will.
Possibly, there are some things going on in your life that have caused a depression in you. I have been there so I can relate. I hunted a few seasons that were far from enjoyable because of this. In this case, walk away from hunting as long as you need to, but still consider yourself a hunter. As your problems are resolved, the drive will return.
Time with family is the biggest part of hunting for me. When I think back, the fondest memories are not of the animals I have taken, but the adventure shared with my Dad and brothers, cousins, Grandpap and uncles over the years. If you have nobody to share it with, find a young person who is in need and brighten his/her life with all your knowledge and friendship. I guarantee you will find new purpose in hunting and the memories will last you the rest of your days.