For context, we are both eachother's "firsts" and are in a mid distance relationship where we only see eachother sometimes once a month or two months and with those chances, we have sex. These chances usually have a time limit and are hurried because of our environment.
My partner has expressed to me that this aspect is where he feels most connected and loved because of us sharing such intimacy and I also feel that way. However, I've been having issues with "letting go" during the act and have never been able to fully release. This then, leaves my partner feeling like he's incapable of satisfying me and it makes me feel frustrated that I'm not able to just be in the moment and enjoy it. We both are just really confused as we have no prior experience in this aspect.
I would just like some advice or opinions on what I should do to be able to relax in those moments and just let go, especially since those moments for us are rare.