That's great you're already making the change! It does take a while to come completely out of your shell. That sounds cool about becoming a horse trainer.
I've only benn horse back riding two or three times, but adore horses. They're such sweet and calm animals. Good luck with where you're going. Personality and manners will get you far, sometimes even over a competator with more experience but bad sociall skills.
As for me... currently I'd like to be a substance abuse counselor, with a major in psychology. I'm also into adolescent development and grief counseling. I may change my mind as to what I will specialize in, but I'm pretty sure I don't have to make the decision for another four years.
So, do you have any siblings? What's your family like?