You and me both- just did mine today and that was my exact experience. I remained calm, but was really disappointed that it didnt go as smoothly as id hoped.
Also, i dont know if this will help but if you ran out of time, it’s probably bc u spent more time at the start considering the answers- meaning u have a higher chance at getting those right then if u had just rushed through the entire exam to get it all done. So dont overthink it to much.
Its an extremely difficult exam and I think its rare to come out thinking you aced it- you never know, so remain positive (im applying to oxford so i too am telling myself this!!) dont give up, the worst they can do is say no- and that would be the same result as having not sat the LNAT/ applied. Be proud of yourself for even taking it!! And you never know, cambridge etc they actually care more about the essay so you really dont ever know and theres no point in dwelling on it now because its over (thanks god!!)
Good luck to all of us, at the end of the day we gave it our all and its out of our hands!