Why isn't pleasurable for me?

I am a 19 year old female.. I've been having for almost a year now.. Naturally, it didn't feel good my first time, but I expected that.. But thereafter, it didn't hurt, but it didn't feel good either.. I don't have a low libido.. I get turned on just fine.. At first I thought I wasn't getting enough lubrication, but even after I got some lubricant, it still doesn't feel good.. My boyfriend and I have tried every position.. And I don't feel any pain.. Only a slight discomfort.. is fine.. And I masturbate regularly.. Yet I don't feel the pleasure that's said to be normal during .. I know I don't have any STDs.. Is there something wrong with me? Is my pelvic area not shaped right?? Someone please give me advice!! I desperately need it!! Thank you!!