1. I wish I’d had the courage to live a life true to myself, not the life others expected of me.
2. I wish I didn’t work so hard (almost exclusively from male patients)
3. I wish I’d had the courage to express my feelings.
4. I wish I had stayed in touch with my friends.
5. I wish that I had let myself be happier.
More here. To what extent is the “minimize future regret” heuristic a good one for making decisions? That heuristic’s the driver behind my “always say yes” rule.