My first dick was an 11 incher about 7 or 8 inches around - seriously. And he managed to get it in and fuck me without any pain whatsoever. A bit of discomfort and not knowing what to do, but not pain. I was able to take him many more times the rest of the time I lived there and he was able to teach me a few things or two and vice versa. I was pretty much hooked from the time he got all the way in.
I did suffer bit of a crisis when I was with my first average sized guy, though (though there were several more 8-9" guys who fucked me after the 1st dude had gone off, they were all in a row, so I was used to all big dick by then) - because that was the first time it hurt, ironically. I guess the big dicked dudes knew what they were doing better even with a virgin ass? Or I had a muscle memory for big dick? Either way I tried doing some topping there but it never ended in me enjoying it, and I gave it a fair shot, so I knew it was back to bottoming.
Then I learned how to work with different cocks and learn how to be a good bottom in as many ways as I could, and how to accommodate all kinds of different tops (I can take the average sized dick now, lol). Once I got that down it got to the point where when I get fucked now my dick just will spontaneously cum on its own and my whole body will shake with the orgasm and I don't even need to touch my cock and it's so intense of an orgasm that I want nothing to do with topping. Big dicks bring more of that and harder and more frequently than regular sized dicks, but all good fuckers will get me off. And yeah, because I was "raised" on big dicks they'll always be my favorite.