I am 14u player. I play PONY baseball.
I have been pitching consistantly for about 4 years now.
I am 5 6' and 112LBS. I Throw about 70-80 mph.
I am fairly skinny, which makes people, at first sight, not think I throw very hard. I tend to have problems with my control, as comes with my hard throwing. I tend to throw my neck, and therefore my arm reacts as so. I am in a Baseball Academy, and we work on these mechanics.
I reccomend getting 4 by 5 board, about 5-8 ft long and getting on that, doing dry mechanics. Going back and fourth, moving your leg and body as you would pitching, but in slow motion. This will concentrate on where you need to work in balance. If it gets easy, try it with your eye's closed! Boy, I am still working on that one, feels like I am on the empire state building! : ) Also, I throw 3/4 (angle) and I have been told that, because my head/neck is falling towards 1st base, (righty) that my arm angle changes constantly, which isnt good.
I wouldnt sweat it, it will take him a few good games, he will have his confidence up and go right at the batters.
Also, I can relate to what you said about him being afraid that he is going to hit the batters, I felt the same way, I could go perfect strikes in practice, then I would get live, and be throwing outside every batter, I grew out of it, as will he too, its just a thing that comes with experience.
My old coach used to tell me, when you start being afraid, thats when you get hurt.
So keep that in mind, and get him just to play "catch" like all coaches say, with the catcher. As simple as that may seem, it really works. Just what I try to do is to act like there is a batter in the box. Once he gets better at that he'll be able to place the ball wherever he wants.
GOOD LUCK,
~RBI Baller