One thing to try, if you haven't already, is to approach intercourse in a way where you're both thinking about and doing it more like you're pulling him in than he is pushing into you.
In other words -- I'm going to be pretty explicit here so it's clear -- if he leans into you with his body, with his penis at your vaginal opening, and instead of pushing in, waits to feel your more subtle movements of your vaginal opening slowly widening, as it will tend to, and enters very, very gradually (and always with lots of lube!) as he does that, only going in deeper as he feels your body yield or pull in, this might feel different for you. The extra bonus with this way, too, is that it doesn't make the same demands of a partner's erection as other approaches can. If your partner starts soft or softer, or even gets that way on and off as you do this -- you can stretch it out over a long time -- it truly doesn't matter. I mean, it doesn't matter, period, it's not like anyone *has* to be having sex in a certain way, and rubbing genitals together can often be just as satisfying as having them "fully" interlocked, but hopefully you know what I mean.
It might be his body is different than your last partner's for sure. But there also isn't only one way to do this, exactly, and the way people move with this can make a real difference sometimes. It may be that your last partner had more awareness of what I'm talking about here and that's what he was referring to when he talked about your body feeling ready to him (and why your body felt more ready to you).
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead