The bow is going to shoot exactly the same every single time. I have watched some world class shooters (and I mean that.... world class) shoot some equipment where the arrow just looks like its flying like a bottle rocket with no stick. Fish tailing and kicking... but a good shooter is someone who is extremely repeatable.... and since the bow is doing the same thing everytime and so is the shooter..... they shoot into one hole all weekend long.
To sum up.... maybe its you..... not the bow.... but I will say that confidence in your equipment has a lot to do with your state of mind.... and that has a huge effect on your results. So if you have no faith in your equipment... maybe you should start all over.