Yes, I have changed (mercifully) and I still have plenty of room left for more change for the better.
I have been married for 12 years to my college sweetheart.
We married at age 48.
When we dated in college and for a while afterward, I was in the throes of my drinking and using.
I created consternation, disappointment and havoc wherever I went.
I married a woman I met in a bar somewhere along the line and we divorced 21 years later.
I had not seen my current wife during that interim.
When we got back together, she said that she couldn't believe how calm I am.
When we dated as young adults, I was certainly anything but calm.
I was immature, self-absorbed and dishonest.
She has a rather ebullient personality, so we kind of complement each other.
She is right that I am a very calm person.
For me, the change in demeanor (and attitude and outlook on life) came over a period of many years of intense AA and pursuit of a daily relationship with God.
I didn't try to be calm, it just came as a by-product of those 2 efforts on my part.
I have changed in plenty of other ways, both in the home and workplace environments.
Great thread - thanks for starting it.