I got 22 BUT I would have gotten ALL of them 15 years ago - and worse. Work on the self DOES make a difference. You can't change your nature, but you can optimize the helpful parts and minimize the negative parts. And here I mean helpful and negative in terms of achieving one's aim. There are some stresses that it is useful to avoid or minimize, and some stressors that it is useful to expose yourself to again and again so as to develop mastery. As is said: courage is NOT being fearless, it is doing what needs to be done even if you are afraid.