What is your least favourite part about cycling?

My cycling angst - before most group rides i worry that i will not be fit enough, i will drag everyone down, be the weakest link, might cause a crash, will not be good enough, might need to bail etc etc

Very few of these have ever happened, but they are the mental gremlins

Felt like this majorly before riding Paris blackpool with 40 strangers. Showed up with the hetchins and you could see the smirks from the guys on the fancy carbon... Ended up totally dicking on most of them. Was a great feeling, those guys should've ridden more hills!