My feet hurt a lot after like 15 minutes of skating

So basically the title, there isn't much to say. I rent skates every time, and my foot size is practically EU39.5 , some shoes I have are 39, some 40 and there isn't much to it. With rental skates I have to rent 40 (39 are too small) and usually wear like the thickest socks I have to fill the space out so I don't get uncomfortable and it still hurts like hell, i skate like for 5-10 minutes and have to sit and rest for at least 10 because they hurt so much. I used to skate when I was little-er and I got 39 skates and my feet didn't hurt almost at all after skating for the whole hour. I'm not sure if the problem is with the skate but it feels like it. I went skating with my friend who also hasn't skated in even a longer time than me and he skated the whole hour just fine while I had to take breaks because of my feet. Anyone have a solution??? Xx