As a gay man who thought of himself for years as a top, I agree wholeheartedly.
My first experience trying to bottom was horrible. My partner and I were young and inexperienced and had no idea what we were doing.
That put me off the whole idea of bottoming for a very long time. I bought into the notion that gay men are divided into naturally occurring top and bottom categories, and just decided I was a top.
I thought that was like nature or something.
And frankly, I was perfectly happy with oral sex anyway.
It took a patient lover, plenty of lube, and lots of practice for me to figure out what I was missing.
And as you describe so well, I was missing quite a lot!