Anyone else have a young horse like this?

What you got for your horse was excellent training. Just because she's a mustang doesn't mean she will be psychotic! I bought a my second horse as a two year old (so was my first)-He was amazing on the calm scale and also liked "the walk"! I sold him to the people who own the place where I board-he is coming five now and has a great temperament. Most people would be happy with what you have achieved!!