I think it's entirely normal for one to have regrets about their childhood/teenage years. I came from a broken home and experienced poverty first hand, ie, electricity turned off, heat turned off in the winter (we had to sit by the oven cranked up and open). I got involved in drugs at an early age, I first smoked crack @ 14, meth, mushrooms and weed followed. I remember stealing my mom's car with my buddy whilst eating magic mushrooms, it was all fun until we realized we were going the wrong way down a highway! Luckily we pulled to the shoulder and it ended up alright.
I dropped out of high school @ 15, mainly because I kept being robbed, threatened, and whatnot (joy of being white in a poor neighborhood). I started selling weed/hash/mushrooms when I was 17, but it didn't take long to graduate to the hard drugs. By the time I was 18 I was traveling the province (I live in Canada) slanging crack. Later that year I was arrested. I refused to cooperate, and in my youthful ignorance plead guilty, accepting a two year federal sentence.
I spent my late teenage years in penitentiaries facing the same issues that I faced as a younger boy, violence and drugs. By this point I wasn't as easily intimidated, so I handled my situation in prison quite a bit better than I had in high school. Eventually I was released, however I fell into the trap, and was back inside prison walls in less than a year, for a parole violation.
Eventually I straightened out my lifestyle and began working low level labour jobs. I began to realize that I was able to do more with my life, and began adult education.
I started my studies from the grade 10 level, what 15 year olds are studying. No one thought that I would succeed, and they routinely told me that I was wasting my time. Despite the lack of any encouragement I followed my plan.
Now I've attained the prerequisites to enter my local universities engineering program. I'll start studying there in a few weeks.
Moral of the story: few lives begin in an ideal manner, but every day is a new beginning.