Nothing boosts your confidence more than a 15 yard shot.

I know most of us can shoot nice groups at 30, 45, and sometimes even 60 yards. But that don't mean jack when bowhunting. I'm not a great archer, but I can shoot a 300 on 5 spot occasionally, and I can shoot 4" groups at 45 yards. But you'll NEVER catch me shooting at a deer past 30 yards. I shot the buck in my avatar at 35 yards, and I'll never do it again. I hit him too far back, and it took 2 days to find him.

Every other deer I've killed has been less than 20 yards. I haven't been doing this very long (4 years), but I've killed 9 deer with my bow in 4 years, and I've only wounded one that I didn't recover (deer ducked the arrow, hit above the spine). 8 out of the 9 kills were under 18 yards. It's just hard to miss at that range IMO. Get em in to 12 to 18 yards and your confidence will come back real fast!