Unfortunately I'm the slacker in groups that every one hates, I always had trouble finding something I didn't suck at, dating back since grade school... I'm definitely a far better worker than a student though!
I have gotten alot better at that since I began school though. After I turned 21, I was partying all the time I'd pretty much be like, "Iight, y'all have fun with that! I'ma go home and get drunk. Peace!" Then come back to class and do presentation hung over, when classmates hadn't gotten any sleep over finishing the project... I have felt bad about being a slacker, or not being able to be as good as it would be if the group duty was left to someone else. Eventually I felt I owed them favors so I'd look for any opportunity to get em back for picking up my slack. Since I generally stayed working with the same group of people we eventually had the time to bond, I was able to figure out things in projects I could do that I wouldn't suck at. 
Sometimes I'd get grouped with people who were generally hard working students, then get around to finding out they hadn't done anything, and got back at me by making ME doing the entire project at last minute, that was hectic and stressful, but uhm, kind of fun.
I began hanging out with the smarter/harder working students than me, feeling that in a way, if it were possible, I could learn from them and there "smartness" or whatever could rub off on me, and I could become a better student.
Since then I feel I've been able to repay the favors to most people that were able to put up with my shit, and remain cool at the same time. I hooked up one guy with a job when we were understaffed during a project, may have not been able to buy him a beer, or help out on school assignments, but I was able to put money in his pocket so he could go buy a new car. Another classmate called me up one day to ask me to help him in moving. I do kind of feel like I was able to balance that out, or something along those lines, and feel a little better about it all.
In the past year all of my teachers, and classmates that have been dealing with me since I began, always remind me on how much I've changed and not the same person I used to be and shit, so that's kind of cool. I'm glad I'm not that person I was years ago.