One thing I have noticed over the years when talking to others who underachieved in high school: Most are so embarrassed and disappointed in themselves for not studying and being an underachiever that, once out on their own, at some point they start burning rubber trying to make up the time they lost...and end doing very well then.
Two of my best friends in high school were like this. Both of 'em were slackers and underachievers. Heck, one of 'em practically gave up his senior year. We were in something called a "Science and Tech" program that was for the supposedly gifted people. We had to do something called a "research practicum" our senior year, and I remember my one buddy just didn't bother. I remember for my project, I tested out the flammability of various types of wall paneling, which was kinda fun.
Even if wall paneling was kinda passe' by the late 80's.
Anyway, that guy ended up doing pretty well in college, and the last I saw him, he was an engineer at an aerospace company. Last time I saw him was 1999 though, so I dunno what he's up to these days.
My other friend ended up totally muffing up in college. He also had an overbearing father and pain in the rear stepmother. They were turning him into a submissive, spineless shell of himself. He finally got fed up with them the summer after his freshman year in college and walked out. I let him stay with me, and because of that, his parents blamed me as a bad influence and, once he went back home, they forbade him to ever hang out with me again. Soon after that, we had a falling out, over other things, and he dropped out of school soon after.
I found out a few years later from a mutual friend that he was gay, and I think that actually explained a lot. Looking back, I imagine my buddy was probably really frustrated and confused, trying to figure out just what he was. And I know full-well his parents would have banged him over the head with a Bible until he either "saw the evil of his ways" or died from internal bleeding, so he was probably heading for a self-destruct mode.
I thought about him though, and tracked him down about a year or so ago through classmates.com or one of those sites. Turns out he's out west somewhere, been with his significant other for about 10 years, got a good accounting job that he really likes, and seems to be doing really well for himself. I told him if he's ever out this way to look me up, but he pretty much cut all ties with his family, and there's just too many bad memories back this way, so there's really not much reason for him to come back this way. Sad that his family pushed him to the breaking point and he had to cut all ties with them, but with some families that's what you have to do. I'm glad for him though, that life's finally working out for him.