Why Don't I Like Oral?

Claire
My BF of three years has tried all sorts of stuff to get me to like it - studied porn, had me sit on his face, 69, everything. But I just don't like it. To me it just doesn't feel super sensitive. What is he doing wrong - or is it just me? I can orgasm from rubbing my clit on my own but my favorite is being fingered - I can cum over and over from that. 
TL;DR - how can my BF improve oral, or is not liking it normal?