⚠️Sex Hurts help!!⚠️

So i’m 4’10 and underweight so pretty petite and my boyfriend is like 5’10 and big and whenever we have sex his dick going in hurts and once it’s in it feels really good but every time he first puts it in he has to go really slow and then my pee after also burns (we go pretty rough though) and we have just tested negative for all stds a few days ago and i was just treated for a uti and yeast infection so i’m not sure why i’m having this pain!! i also got a pap smear a few days ago and she said everything looked normal but there maybe some leftover bacteria from my yeast infection but not to worry and gave me a cream it has always hurt with my boyfriend whenever it first goes in and it did for awhile with my ex as well (i think) i can’t remember much of that relationship because i always felt like i was going crazy so i can’t exactly pin point it but can someone help! my boyfriends dick is prettyyy big and considering i’m very little i wasn’t sure if that was the issue (we also use astroglide lube because it’s hard for me to get wet)