Only orgasm through oral

No matter how hard I try with manual stimulation (fingering/rubbing my clit) I cannot orgasm. Sexual intercourse and my boyfriend manually stimulating me have also never brought me to orgasm. However, I have amazing orgasms through oral stimulation of my clitoris, sometimes with very little effort (I've orgasmed in under 2 minutes)- is it normal to only be able to come in one way? I've experimented a lot with techniques with no luck, it doesn't bother me too much I just want to know if others are in the same boat 😂