I call them lessons learned. I don't regret anything, because I always make 100% sure that I am okay with that decision and the consequences of it. I believe that in life, you learn many lessons, but you never try to hurt people or yourself on purpose
I have made plenty of stupid and pointlessly bad decisions in my life. I have wanted to change some of them and others i quite enjoy looking back on. Sometimes being stupid leads to the best decisions and other times the worst. Learn from this.