I dropped out of the biology department because there was a class on identifying animals that I couldn't pass. I still regret it. If I had had more tenacity, I would have raised bloody furry with the disabilities department to get enough accommodations and taken that course over and over again until I passed. Another reason why I quit was that everyone around me was cheating, so I tried cheating myself and I got semi-caught the very first time. Lack of subtle social skills, right? I knew cheating isn't in line with my ethics and so I decided to quit instead of keeping with that.
With what I know now, I wish I had stayed. If I had gotten beyond those first courses, the intense competition fades a bit. I was never going to be the best science student ever, or the best scientist. But I could have made a pretty good one. I would have been a pretty good graduate assistant teacher, too. I think I would be happier if I had stuck with it because I really love science and its not a part of my life at all now.