why can't i orgasm

it seems like the only time that i orgasm is when i go to town all on my own. my boyfriend and i have sex often and it's great. mind blowing. to the point where him and i both need to catch our breaths afterwards. but it seems like no matter what position we try or all the different sex toys i just can not orgasm. but it's weird because the only way that i am able to have an orgasm is when i play with my clit on my

own.