Why do people say I've ruined my life by having a son at nineteen, when it really made my life better?

Having a son is the greatest thing to ever happen to me. I just don't get why people say I've ruined my life, when I only feel happier than I did before. I was miserable in high school, and I was miserable in my college course. I was just miserable throughout my teenaged years. I mean, yes, I don't have a proper education, but I have a son, which is so much better than anything I could ask for. Do you think I've ruined my life? I just don't understand why people say this. What are your opinions?