When I was ten my parents got a divorce and it wasn't pretty. I became bitter and angry at everyone all the time and curled up in my shell. Then my mom got me into horseback riding and I started to take lessons. It was a slow process, but I slowly went from an angry child to a happy one. The horses took my mind off of my parents and everything going on at home. I didn't come out of my shell, though, until a year ago when I decided after two years of not having a horse of my own, and being able to afford a horse on my own, I decided to go looking for a horse. I found Apollo, and even though we were both practically green (I'd never worked with a green horse before, only ridden lessons horses) the barn owner said she'd help me work with him. Long story short, working with Apollo and working with the barn owner, being surrounded by the people at the barn and the horses, I found myself coming out of my shell. Now, more than a year later I'm more social than I'd ever been before.
So yes, I agree that horses help, ALOT :) and probably without horses I would still be this angry person who didn't want to talk or open up to anyone.