Stuck in the same position :/

Ever since I started masturbating back in middle school, I'm only able to orgasm in one position, that position being with me lying on my bed kind of like a mummy with my legs together, straight out on the bed, muscles flexed and rubbing my clit. I can't orgasm any other way, I've tried with my legs open, sitting, pillows, fingering, showerheads and nothing seems to work. I've been with my boyfriend for a little over a year and in my opinion he's great at what he does. He does get bummed out that he can't make me orgasm but overall he's been a good sport about it. I just want to be able to orgasm in different positions! I'm thinking my body has just gotten so used to that position and my mind has convinced me that there's no other way. Anyone out there have this issue or have any advice?