New to sex please send help

Dominique

So I had sex for the first time last night (actually like 5-6 times over the course of the night and morning) and it was interesting to say the least. Once we got past the whole this hurts bit it was ok, but I had trouble getting going. As he thrusted it felt like he was hitting something inside me and while it didn’t hurt persay it wasn’t the most pleasant feeling either. Any ideas on what might have been going on? Lubrication was not an issue as I was plenty wet 😅, but I just don’t know what this feeling was, and it made it basically impossible to get off, as in, I got nowhere even in the ballpark

Update: he’s about 5.5inches, we did try a few different positions. From behind didn’t work because he kept falling out, me on top was ok except I was too short to get good balance on top of him because he has a wider build, and I guess I kept moving my hips wrong so he’d fall out then too.