I can't orgasm from fingering/oral. Is this normal?

Kaitlyn • livin the dream
I have never orgasmed from fingering myself, or when my boyfriend does it/gives me head. I can only do it by vibrating or humping something... How can I improve my orgasmic flexibility, for lack of a better term? I'm 19 and this is the first boyfriend I've had regular sex with. It is very frustrating because while what he does feels great, I have never climaxed that way.