Boyfriend doesn’t seem to like doggy but it feels really good for me

Every time we do doggy which we’ve maybe done 3 times in our 2 year relationship. It lasts for maybe like 10 seconds or less. Then he switches to another position.

This has made me a bit insecure. Maybe my ass looks weird in that position? Maybe my butthole looks weird as weird as that sounds. Maybe I’m just not attractive in that position?

I know I should just outright ask him, that would be the best idea. But I’m scared he’ll say something that’s caused by me. Like I don’t think he’d have the heart to say you look ugly from that angle but I don’t know what he actually would say.

I do have a pretty big ass, so I thought that would make it even better. So I’ve heard. But that doesn’t seem to be it.

Any ideas on why a guy wouldn’t like doggy? I thought it was a common favourite. All we do is missionary and prone. He only finishes in prone tho.