In my job interviews people asked me what I studied, what classes I took.

Not once "what grade did you get in the particular class?" Nobody looked over the diploma supplement when my grades (and straight As they were NOT).

On class reunions people often laugh at the fact they sucked at one class, how they had to retake it...

Nobody cares about grades once you are out of school. Getting your diploma with sanity intact will get your further then breaking yourself over not having perfect grades. Grades do not really reflect intellect or skills all that much anyways.