It happened to me too last night, however it wasn't because I can't keep up with them ( I always do otherwise) but rather because you can't show up with any kind weakness to this hammerfest rides and expect not to get dropped. You better be fresh and ready to put it all in the line or else. Unfortunately for me last night I didn't feel good, not to talk about the heat!, but didn't learn this after 15 miles into the ride,
had no choice but to pull the plug and drift my way back home. It can happen to the best of us if it's not a good day.
To the OP, you'll get better, I guarantee you that, don't get discouraged.

Corsaire