There will be other chances and the season is early yet. It is a very hard decision to draw-down on an animal that you would like to take but you definately made the right call if the shot placement was not there.
Last year I was at full-draw on a solid 180 class buck at a watering hole as it stared directly at me through a ground blind at twenty yards. It never did turn enough to even offer me a quartering to shot (also a difficult shot IMHO) After about 20 seconds (seemed like an eternity-I was shaking like a leaf!
) in one swift movement, it bolted straight up in the air, rotated 180 degrees, and bounded off- leaving a few, light blades of dry switchgrass to flutter back to the Earth. The move looked like something straight out of a classic Tom & Jerry cartoon. At the time though, I did not feel at all like laughing. I was tormented over those critical seconds as to whether I should have tried taking the shot, etc, etc, etc. After a few days of second guessing my decision, I was pleased with myself that in the heat of battle, I relented my own selfish desires and reverted to being a sportsman with solid hunting ethics.
I believe it truly comes down to really knowing your own limitations KT. I knew that I could not successfully make that shot-perhaps others could have. This is why it is absolutely critical to practice like crazy from whatever elevated shot angles, ground rises that you may encounter-so when the moment of truth arrives, you do not even think about it- somehow the pin got placed behind the shoulder and you cannot quite recall ever touch off the trigger that released a well placed arrow to your quarry.
Practice that close shot for next time. If you can hit that shot 9 out of 10 times from an elevated stand into a target repeatedly, you'll most likely place yourself in a position for success later should this same shot opportunity present itself. Good luck!