This image above shows the power demands by training zones, of a draft-legal triathlon. This is also what you might see in a group ride, where riders attack and bridge gaps.
This second image shows an Olympic non-drafting power file by an age-group triathlete. You can see the difference in the demands of the energy systems placed on the rider, depending on the race.
So if you're training for a non-drafting race, by mostly doing group rides, with attacks and bridging, then you can see you are not training specifically. And specificity is the key to high performance.
If you want to train more specifically, get a power meter and start to track the specific demands and metrics, making sure you are training those.