I should point out that I've analyzed all my own crashes (seems like endlessly). I've had some bad ones, I've had some harmless ones. I crashed on my own frequently for about 5 years, learning limits. For the next 20+ years I basically crashed due to others, with two exceptions.

The worst for me are wet corners - with such a wide range of traction levels available at a given time, I tend to be very slow in wet turns.

Everything else I've drilled/practiced and know that I'm okay, therefore I'm not afraid. This goes for group riding, cornering hard in all but wet conditions (solo/group), descending fast on unknown roads (solo/group), etc.