I think it's called the 'Back Yard Champion' syndrome. :-)

Check out some mental management stuff, like Troy and Lanny Basham on http://www.mentalmanagement.com/mmindex.htm

Start with What every Archer should know first about the mental game

I've listened to this cd many times and plan to buy the next one. Several of the pro shooters (I know) use these. Check them out.

You're not alone. What issues you have are very common.