Is this because my bf's "member" is on the smaller side? NSFW?

I’ve had an ex for 5 years that was over 7 inches, he was really big so that’s what I was used to. Anyways, my new boyfriend is about 5.5 inches and I feel like he doesn’t fill me up as much. It’s funny because his finger satisfies me so much more than his penis and his finger is tiny and skinny than it! Could it just be that he doesn’t know how to hit the right spot?

What’s weird also is that I have learned that different positions feel better depending on the person. Online articles are bogus when they say doggy feels better with a smaller one…it doesn’t I feel like missionary is best.

Also when I try to go on top it doesn’t feel good for me at all, I feel less. I can’t go up high as much, I never had that issue before.

Also, it’s funny cuz he told me that I feel tighter than his ex. Must be because I do kegels. He’s not experienced though, I’m his second partner and before me he only did it twice.