please answer!!!

i had sex with my boyfriend yesterday and it was his first time ever and it was my first time with him. i’ve had sex multiple times with another person before i started dating my boyfriend and with the other person i’ve done doggy and it didn’t really hurt but for some reason it hurt when i did it with my boyfriend. i told him that it hurt so we stopped doing that position but i know that position made him feel really good so i’d like to be able to do it again. do you think there’s any reason it would hurt with him and not the other person i’ve had sex with ?

also my boyfriend is notably bigger than the other person i did doggy with so maybe that’s why it hurt but i don’t know...