You've heard the opinions, I'll add mine. I was the guy that was slowing the rest of the group down. Never ridden with them before, only knew a couple of guys. They rode WAY over my head. FAST. Faster than I felt good about. They did keep waiting for me at corners, but I eventually bailed to let them ride their ride. I rode mine back home.
You did the right thing.
(Paraphrased from memory) "You have eaten deeply at the table of knowledge, but still you are not nourished" - Amanda