too much pain?!?

i’m 16 and lost my virginity with my bf a few months ago, we did it in a changing room and it was so painful!! last weekend he fingered me as well on my sofa and it hurt so bad! i had to fake an orgasm so he’d stop, idk what to do. i usually masturbate and it doesn’t hurt so why does it hurt when he does it or we have sex? i want to enjoy it with him but currently it’s putting me off