I'd say that you're a new hobbyist shooter who is learning the joys, challenges, beauty, discipline, and some times frustration involved with the mystical flight of the bullet. Don't label yourself a "plinker" like is some plague on the shooting world.
Low left impact is common. It could be any number of things. I suggest getting some training. Practice all you can. Buy some snap caps and dry fire.
This video may help some http://video.google.com/videoplay?do...32856867071363