A lot of the bad things which happened to me were out of my control so I can't really say I regret having wasted time in school because I had no choice. I wanted to drop out of school when I was in 3rd grade because by then I'd realized there was nothing I'd gain . . . and to be honest all the years of schooling didn't benefit me in any way.
Anyway what I regret the most is wasting my time trying to make it into the entertainment industry. I almost did though but that's very much like saying, "I almost scored" = Failure.