In my book, one thing that constitutes an emotionally healthy person is expecting that you're an imperfect being and always leaving room for improvement. The ways to better yourself as a person are endless: you can work on accepting yourself more, forgiving others more easily, or becoming more assertive. This, of course, doesn't mean that you shouldn't love who you are as is, it just means that you're a work in progress, which is a good thing.
Obviously these kind of changes don't happen over night; in fact, they can take years and a lot of determination, which is what makes the change that much more significant. But let's face it, wouldn't it be wonderful to just flip a switch and have a complete change take place? If you could change one thing about yourself instantaneously, do tell, what would it be?